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CAS No. : | 114873-12-0 | MDL No. : | MFCD01862941 |
Formula : | C14H17Cl2NO4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | - |
M.W : | 334.20 g/mol | Pubchem ID : | - |
Synonyms : |
|
Num. heavy atoms : | 21 |
Num. arom. heavy atoms : | 6 |
Fraction Csp3 : | 0.43 |
Num. rotatable bonds : | 7 |
Num. H-bond acceptors : | 4.0 |
Num. H-bond donors : | 2.0 |
Molar Refractivity : | 81.36 |
TPSA : | 75.63 Ų |
GI absorption : | High |
BBB permeant : | Yes |
P-gp substrate : | No |
CYP1A2 inhibitor : | No |
CYP2C19 inhibitor : | Yes |
CYP2C9 inhibitor : | Yes |
CYP2D6 inhibitor : | No |
CYP3A4 inhibitor : | No |
Log Kp (skin permeation) : | -5.66 cm/s |
Log Po/w (iLOGP) : | 2.36 |
Log Po/w (XLOGP3) : | 3.77 |
Log Po/w (WLOGP) : | 3.51 |
Log Po/w (MLOGP) : | 3.01 |
Log Po/w (SILICOS-IT) : | 2.97 |
Consensus Log Po/w : | 3.12 |
Lipinski : | 0.0 |
Ghose : | None |
Veber : | 0.0 |
Egan : | 0.0 |
Muegge : | 0.0 |
Bioavailability Score : | 0.56 |
Log S (ESOL) : | -4.04 |
Solubility : | 0.0307 mg/ml ; 0.0000919 mol/l |
Class : | Moderately soluble |
Log S (Ali) : | -5.05 |
Solubility : | 0.00297 mg/ml ; 0.00000888 mol/l |
Class : | Moderately soluble |
Log S (SILICOS-IT) : | -4.38 |
Solubility : | 0.014 mg/ml ; 0.0000418 mol/l |
Class : | Moderately soluble |
PAINS : | 0.0 alert |
Brenk : | 0.0 alert |
Leadlikeness : | 1.0 |
Synthetic accessibility : | 2.99 |
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | N/A |
Hazard Statements: | H315-H319-H335 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | With O-benzotriazol-1-yl-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine In DMF (N,N-dimethyl-formamide) at 20℃; for 18.5h; | 2B Step 2B: {1-(2,4-Dichlorobenzyl)-2-[4-trans-(2-hydroxymethyl-cyclohexyl)-piperazin-1-yl]-2-oxo-ethyl}carbamic acid tert-butyl ester TRANS-4- (2-HYDROXYMETHYL-CYCLOHEXYL)-PIPERAZINE-1-CARBOXYLIC acid tert- butyl ester 3 (1.40 g, 4.7 mmol) was dissolved in dichloromethane (20 ML) and to that solution, trifluoroacetic acid (10 mL) was added. The resulting solution was stirred at room temperature for 7 h. The volatiles were removed in vacuo and the residue was then dissolved in DMF (10 mL) and treated with diisopropylethyl amine (1.80 mL, 10.3 mmol). This solution was set aside. In a separate flask, a solution containing (R) -Boc-2, 4- dichlorophenylalanine (1.73 g, 5.2 mmol) and diisopropylethyl amine (1.80 mL, 10.3 mmol) in DMF (25 mL), was treated with O-benzotriaozl-1-yl-N,N,N', N'- TETRAMETHYLURONIUM hexafluorophosphate (HBTU, 2.32 g, 6.1 MMOL). The resulting golden yellow solution was stirred at room temperature, under N2, for 30 minutes. The solution previously set aside containing the deprotected piperazine was added, and the resulting mixture was stirred for 18 h at room temperature. The reaction was diluted with EtOAc (100 mL) and washed with 0.1 N HCl and then with saturated NaHC03. The organics were washed with brine, dried over anhydrous MGS04 and filtered. The residue was purified by column chromatography, eluting with a 3: 1, then a 2: 1 v/v mixture of hexanes and EtOAc. The ester product was obtained as a light brown foam (1. 83 g, 2.2 mmol, 94 % yield based on (R) -Boc-2, 4-dichlorophenylalanine). LCMS m/z 831 (M++1). The above ester (1.75 g, 2.1 mmol) was dissolved in EtOH (5 mL) and treated with KOH (250 mg, 4.5 mmol) dissolved in H20 (1 ML). The resulting mixture was refluxed for 2 h, cooled, diluted with H20 (PH-8-9) and extracted with EtOAc. The organics were washed with brine, dried over anhydrous MGS04 and filtered. Evaporation gave the residue as an orange foam. Purification was performed by column chromatography on silica-gel, eluting with a 2: 1 v/v mixture of EtOAc and hexanes, respectively. Compound 4 was isolated as a white foam (765 mg, 1.5 mmol, 71 %). LCMS MLZ 514 (M++1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
69.8% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; for 8h; | 12 (i?)-2-tert-Butoxycarbonylamino-3-(2,4-dichloro-phenyl)-propinoic acid (150 mg,0.712 mmol) is dissolved in a solution of EDC (151 mg, 0.783 mmol) and HOBt (144 mg, 1.067 mmol) in 5 ml DMF, and l-(5-Chloro-2-methyl-phenyl)-piperazine (237.6 mg, 0.712 mmol) is added to the reaction mixture followed by DDPEA (459.8 mg, 3.55 mmol). A clear reaction solution is obtained and stirred at room temperature for 8 h, and the product is then extracted with ethyl acetate (25 ml). The organic layer is washed with saturated NaHCO3 and saturated NaCl solution (15 ml each), and the organic phase is then separated, dried with Na2SO4 and evaporated in vacuo resulting in [(R)-2-[4-(5-Chloro-2-methyl-phenyl)-piperazin-l-yl]-l-(2,4-dichloro-benzyl)-2-oxo-ethyl]- carbamic acid tert-butyl ester (262.4 mg, 69.8%), (m/z 528 [MH+]). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
78% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; In dichloromethane; at 20℃; for 24h; | To a stirred solution of Boc-2,4-dichloro-d-phenylalanine (0.280 g, 0.84 mmol), EDC·HCl (0.161 g, 0.84 mmol), HOBt (0.170 g, 1.26 mmol) and DIPEA (1.12 mL, 6.29 mmol) in DMF (2.0 mL), <strong>[496-12-8]isoindoline</strong> (0. 10 g, 0.84 mmol) was added. The reaction was stirred at room temperature for 24 h. Upon completion, solvent was removed under reduced pressure and the crude was purified using column chromatography to provide desired coupled product in 78% yield. To the purified compound (0.21 g, 0.48 mmol) was added 1 M HCl (9.5 mL, 1 M in Et2O). After 4 h of stirring, the solvent was removed under reduced pressure to afford target compound 4 as a white solid. 1H NMR (400 MHz, CD3OD): delta 3.42 (d, 2H, 8.0 Hz), 4.24 (d, 1H, 12 Hz), 4.63 (t, 1H, 8.0 Hz), 4.72 (d, 1H, 16 Hz), 4.89 (d, 1H, 16 Hz), 5.00 (d, 1H, 12 Hz), 7.26 (m, 1H), 7.35 (m, 4H), 7.44 (d, 1H, 8.0 Hz), 7.54 (d, 1H, 4.0 Hz) 13C NMR (100.6 MHz, CD3OD): delta 35.3, 52.1, 53.2, 53.6, 123.7, 123.9, 128.9, 129.1, 129.2, 130.7, 132.1, 132.4, 136.0, 136.3, 136.4, 136.6, 168.1 HRMS (TOF-MS) Exact mass calcd for C17H16Cl2N2O [M+H]+: 335.0718, found: 335.0712. |
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; In N,N-dimethyl-formamide; at 20℃; | General procedure: A literature procedure1 was modified by replacing triethylamine with N,N-diisopropylethylamine. To a stirred mixture of tetrahydro<strong>[496-12-8]isoindoline</strong> (0.11 mL, 1.0 mmol), N-Boc-(R)-phenylalanine (265 mg, 1.0 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (182 mg, 1.0 mmol) and anhydrous 1-hydroxybenzotriazole (203 mg, 1.5 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (1.3 mL, 7.5 mmol). The mixture was stirred at 20 for 16 h. The solvent was evaporated and the residue was dissolved in ethyl acetate (20 mL) and the solution was washed with water (2 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (2 x 20 mL) and all the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL) then with brine (20 mL) filtered and dried (MgSO4). Column chromatography (25:75 ethyl acetate: dichloromethane) of the residue gave 7c (175 mg, 48%) as a cream solid, |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
88% | Stage #1: (R)-2-(tert-butoxycarbonylamino)-3-(2,4-dichlorophenyl)propionic acid With 4-methyl-morpholine; isobutyl chloroformate In tetrahydrofuran at -50℃; for 0.25h; Inert atmosphere; Stage #2: 2-(3,4-dimethoxyphenyl)-ethylamine In tetrahydrofuran at -40 - 27℃; for 2.5h; | 2.a 197.4 μl of 4-methylmorpholine were added to the solution of 500 mg (1.5 mmol) of (R)-2-tert-butoxycarbonylamino-3-(2,4-dichlorophenyl)propionic acid in 10 ml of tetrahydrofuran under nitrogen, and the mixture was cooled to -50° C. After addition of 194.6 μl (1.5 mmol) of isobutyl chloroformate, the reaction solution was stirred at -50° C. for 15 min, 248.7 (1.5 mmol) of 2-(3,4-dimethoxyphenyl)ethylamine were then added, the mixture was subsequently stirred at -40° C. for a further 30 min and at room temperature for two hours. The reaction mixture was then evaporated in vacuo, the residue was taken up in 10 ml of 5% sodium hydrogencarbonate solution, and the aqueous mixture was extracted three times with 10 ml of ethyl acetate each time. Drying of the combined organic phases over sodium sulfate and stripping-off of the solvent gave 655 mg (88% yield) of tert-buty {(R)-2-(2,4-dichlorophenyl)-1-[2-(3,4-dimethoxyphenyl)ethylcarbamoyl]ethyl}carbamate as colourless crystals. LC/MS (M+Na):520. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; | (R tert Butyl (1-(isoindolin-2-yl)-1-oxo-3-phenylpropan-2-yl)carbamate (7c). General procedure: A literature procedure1 was modified by replacing triethylamine with N,N-diisopropylethylamine. To a stirred mixture of tetrahydroisoindoline (0.11 mL, 1.0 mmol), N-Boc-(R)-phenylalanine (265 mg, 1.0 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (182 mg, 1.0 mmol) and anhydrous 1-hydroxybenzotriazole (203 mg, 1.5 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (1.3 mL, 7.5 mmol). The mixture was stirred at 20 for 16 h. The solvent was evaporated and the residue was dissolved in ethyl acetate (20 mL) and the solution was washed with water (2 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (2 x 20 mL) and all the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL) then with brine (20 mL) filtered and dried (MgSO4). Column chromatography (25:75 ethyl acetate: dichloromethane) of the residue gave 7c (175 mg, 48%) as a cream solid, |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
44% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; for 16h; | (R tert Butyl (1 --(5 aminoisoindolin 2 yl) 3 --(2,4-dichlorophenyl)-1-oxopropan-2-yl) carbamate (13a). To a stirring mixture of 5-aminoisoindoline3 (68 mg, 0.50 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (201 mg, 0.60 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (109 mg, 0.60 mmol) and anhydrous 1-hydroxybenzotriazole (122 mg, 0.60 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (0.78 mL, 0.45 mmol). The mixture was stirred at 20 for 16 h then ethyl acetate (20 mL) was added prior to extraction with water (3 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (3 x 20 mL) and all of the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL), then with brine (20 mL), dried (MgSO4) filtered and evaporated. Column chromatography (1:3 ethyl acetate:hexane) of the residue gave 13a (100 mg, 44%) as a white solid; 1H NMR (500 MHz, CDCl3, rotamers) δ 7.34 (1H, br s), 7.20-7.10 (1H, m), 7.04-6.97 (1H, m), 6.67-6.44 (2H, m), 5.44 (1H, br s), 5.01-4.79 (2H, m), 4.75-4.68 (1H, m), 4.63-4.48 (2H, m), 3.76 (2H, br s), 3.15 (1H, dd, J=13.7, 6.1 Hz), 3.00 (1H, dd, J=13.7, 8.0 Hz), 1.34 (9H, s); 13C NMR (125 MHz, CDCl3, rotamers) δ 170.2 (2 lines), 170.1, 155.1, 155.0, 146.6, 146.4, 137.1, 137.0, 135.2, 135.1, 133.6, 133.0, 132.9, 129.3, 127.0, 125.5, 123.6, 123.5, 115.2, 114.9, 108.9, 108.8, 79.8, 52.4 (2 lines), 52.0, 51.9, 51.1, 36.6, 28.3. HRMS m/z [M+H]+ calcd. for C22H26Cl2N3O3: 450.1351, found: 450.1351. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; | (R tert Butyl (1 --(5 acetamidoisoindolin 2 yl) 3 --(2,4-dichlorophenyl)-1-oxopropan-2-yl) carbamate (13b). General procedure: To a stirring mixture of amine (12b) (100 mg, 0.58 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (201 mg, 0.60 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (109 mg, 0.60 mmol) and anhydrous 1-hydroxybenzotriazole (122 mg, 0.60 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (0.78 mL, 0.45 mmol). The mixture was stirred at 20 for 24 h then ethyl acetate (20 mL) was added prior to extraction with water (3 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (3 x 20 mL) and all of the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL), then with brine (20 mL), dried (MgSO4) filtered and evaporated. Column chromatography (ethyl acetate) of the residue gave 13b (143 mg, 52%) as a white solid, |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; | (R tert Butyl (1 --(5 acetamidoisoindolin 2 yl) 3 --(2,4-dichlorophenyl)-1-oxopropan-2-yl) carbamate (13b). General procedure: To a stirring mixture of amine (12b) (100 mg, 0.58 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (201 mg, 0.60 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (109 mg, 0.60 mmol) and anhydrous 1-hydroxybenzotriazole (122 mg, 0.60 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (0.78 mL, 0.45 mmol). The mixture was stirred at 20 for 24 h then ethyl acetate (20 mL) was added prior to extraction with water (3 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (3 x 20 mL) and all of the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL), then with brine (20 mL), dried (MgSO4) filtered and evaporated. Column chromatography (ethyl acetate) of the residue gave 13b (143 mg, 52%) as a white solid, |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
36% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; for 24h; | (R)-(tert-Butyl (3-(2,4-dichlorophenyl)-1-(5-(methylcarbamoyl)isoindolin-2-yl)-1-oxopropan-2-yl)carbamate (20). To a stirring solution of N-methylisoindoline-5-carboxamide (19) (48 mg, 0.27 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (91 mg, 0.27 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (59 mg, 0.33mmol) and anhydrous 1-hydroxybenzotriazole (55 mg, 0.41 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (0.40 mL, 2.3 mmol). After stirring at 20 for 24 h ethyl acetate (20 mL) was added and the mixture was extracted with water (3 x 20 mL). The combined aqueous fractions were extracted with ethyl acetate (3 x 20 mL) and all the organic layers were combined, dried (MgSO4), filtered and evaporated. Column chromatography of the residue (94:6 ethyl acetate: methanol) followed by recrystallisation from chloroform gave 19 (48 mg, 36%) as a white solid, m.p. 167-168 ; νmax (cm-1) 3550-3180 (br) 2971, 1699, 1639; 1H NMR (600 MHz, CDCl3, 2 rotamers) δ 7.72-7.62 (2H, m), 7.32 (1H, d, J=1.7 Hz), 7.28-7.20 (1H, m), 7.18-7.15 (1H, m), 7.11 (1H, m, J=1.7 Hz), 6.81-6.69 (1H, m), 5.48 (1H, d, J=8.7 Hz), 4.98 (1H, d, J=14.3 Hz), 4.87-4.76 (2H, m), 4.68-4.57 (2H, m), 3.13 (1H, dd, J=13.7, 6.2 Hz), 3.03-2.94 (1H, m), 2.90 (3H, s), 1.34 (9H, s); 13C NMR (150 MHz, CDCl3, 2 rotamers) δ 170.4, 167.9, 155.2, 139.2, 139.1, 136.5, 136.3, 135.1, 134.8, 134.6, 133.7, 132.9, 132.8, 129.3, 127.2, 126.8, 126.7, 123.1, 123.0, 121.8, 121.8, 80.1, 52.3, 52.2, 52.15, 51.1, 51.1, 36.5, 28.3, 27.0. HRMS m/z [M+H]+ calcd. for C24H28Cl2N3O4: 492.1433, found: 492.1457. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
84% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; for 24h; | (R)-tert-Butyl ((2-(2-((tert-butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoyl)isoindolin-5-yl)methyl)(methyl)carbamate (25). To a stirring solution of isoindoline 24 (158 mg, 0.60 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (201 mg, 0.6 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (131 mg, 0.72 mmol) and anhydrous 1-hydroxybenzotriazole (122 mg, 0.9 mmol) in N,N-dimethylformamide (5 mL) was added N,N-diisopropylethylamine (0.89 mL, 5.12 mmol) and the mixture stirred at 20 for 24 h. Ethyl acetate (20 mL) was then added and the mixture was extracted with water (3 x 20 mL). The combined aqueous fractions were extracted with ethyl acetate (3 x 20 mL) and all the organic layers were combined, washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL) then with brine (20 mL), dried (MgSO4), filtered and evaporated. Column chromatography (1:1 ethyl acetate: hexane) of the residue gave 25 (291 mg, 84%) as a white solid; νmax (cm-1) 3294 (br), 2973, 1690, 1640; 1H NMR (500 MHz, CDCl3, rotamers) δ 7.40-7.34 (1H, m), 7.19 (5H, m), 5.35 (1H, d, J=9.0 Hz), 5.01 (1H, d, J=13.5 Hz), 4.88 (1H, s), 4.82 (1H, d, J=15.8 Hz), 4.71-4.58 (2H, m), 4.42 (2H, s), 3.17 (1H, dd, J=13.5, 6.0 Hz), 3.04 (1H, dd, J=13.5, 7.9 Hz), 2.81 (3H, s), 1.48 (9H, s), 1.34 (9H, s); 13C NMR (125 MHz, CDCl3, rotamers) δ 170.3, 155.1, 138.4, 138.2, 136.4, 136.3, 135.2, 134.9, 133.7, 133.0, 132.9, 129.4, 127.3 (br), 127.1, 123.1, 122.9, 122.0 (br), 80.0, 52.4, 52.3, 52.25, 52.2, 51.1, 36.7, 34.1, 34.05, 28.6, 28.55, 28.4. HRMS m/z M+ calcd. for C29H37Cl2N3O5: 577.2105, found: 577.2108. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
52% | With benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine In N,N-dimethyl-formamide at 20℃; for 24h; | (R tert Butyl (1 --(5 acetamidoisoindolin 2 yl) 3 --(2,4-dichlorophenyl)-1-oxopropan-2-yl) carbamate (13b). To a stirring mixture of amine (12b) (100 mg, 0.58 mmol), N-Boc-(R)-2,4-dichlorophenylalanine (201 mg, 0.60 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (109 mg, 0.60 mmol) and anhydrous 1-hydroxybenzotriazole (122 mg, 0.60 mmol) in N,N-dimethylformamide (3.0 mL) was added N,N-diisopropylethylamine (0.78 mL, 0.45 mmol). The mixture was stirred at 20 for 24 h then ethyl acetate (20 mL) was added prior to extraction with water (3 x 20 mL). The combined aqueous fractions were re-extracted with ethyl acetate (3 x 20 mL) and all of the combined organic layers were washed with saturated aqueous sodium hydrogen carbonate (2 x 20 mL), then with brine (20 mL), dried (MgSO4) filtered and evaporated. Column chromatography (ethyl acetate) of the residue gave 13b (143 mg, 52%) as a white solid, m.p. 196-197 °C; νmax (cm-1) 3281, 2920, 2850, 1640; 1H NMR (500 MHz, CDCl3, 2 rotamers) δ 8.26, 8.08 (1H, br s), 7.65, 7.50 (1H, s), 7.34 (1H, d, J=6.3 Hz), 7.21-7.00 (3H, m), 5.45 (1H, t, J=9.0 Hz), 4.86-4.48 (5H, m), 3.14 (1H, dd, J=13.6, 5.8 Hz), 3.02-2.85 (1H, m), 2.15 (3H, d, J=7.4 Hz), 1.32 (9H, s); 13C NMR (125 MHz, CDCl3, 2 rotamers) δ 170.1, 170.0, 169.0, 168.8, 155.3, 155.2, 138.3, 138.1, 136.7, 136.5, 135.1, 133.7 (2 lines), 132.8 (2 lines), 131.3, 131.0, 129.3 (2 lines), 127.1, 123.2, 123.1, 119.6, 119.4, 114.5, 114.3, 80.2, 80.0, 52.5, 52.3, 52.0 (3 lines), 51.0, 36.6 (2 lines), 28.3, 24.5 (2 lines). HRMS m/z [M+H]+ calcd. for C24H27Cl2N3O4: 492.1457, found: 492.1460. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
63.1% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 7 tert-Butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-[5-(methanesulfonamidomethyl)-2,3- dihydro- lH-isoindol-2-yl] - 1 -oxopropan-2-yl] carbamate A solution of N-[(2,3-dihydro-lH-isoindol-5-yl)methyl]methanesulfonamide-HCl (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N- [(2R)-3-(2,4-dichlorophenyl)-l-[5-(methanesulfonamidomethyl)-2,3-dihydro-lH-isoindol-2- yl]-l-oxopropan-2-yl] carbamate (0.5 g, 63.1% yield). |
63.1% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 7 tert-Butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-[5-(methanesulfonamidomethyl)-2,3- dihydro- lH-isoindol-2-yl] - 1 -oxopropan-2-yl] carbamate A solution of N-[(2,3-dihydro-lH-isoindol-5-yl)methyl]methanesulfonamide-HCl (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N- [(2R)-3-(2,4-dichlorophenyl)-l-[5-(methanesulfonamidomethyl)-2,3-dihydro-lH-isoindol-2- yl]-l-oxopropan-2-yl] carbamate (0.5 g, 63.1% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
51.14% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 9 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-(5-methanesulfonoimidami do-2,3- dihydro- lH-isoindol-2-yl)- 1 -oxopropan-2-yl] carbamate A solution of N-(2,3-dihydro-lH-isoindol-5-yl)methanesulfonoimidamide-HCl (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-(5-methanesulfonoimidamido-2,3- dihydro-lH-isoindol-2-yl)-l-oxopropan-2-yl]carbamate (0.358 g, 51.14%). |
51.14% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 9 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-(5-methanesulfonoimidami do-2,3- dihydro- lH-isoindol-2-yl)- 1 -oxopropan-2-yl] carbamate A solution of N-(2,3-dihydro-lH-isoindol-5-yl)methanesulfonoimidamide-HCl (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-(5-methanesulfonoimidamido-2,3- dihydro-lH-isoindol-2-yl)-l-oxopropan-2-yl]carbamate (0.358 g, 51.14%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
71.14% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 10 tert-butyl N-[(2R)-l-(3-cyclopropylpyrrolidin-l-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate A solution of 3-cyclopropylpyrrolidine hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-l-(3- cyclopropylpyrrolidin-l-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl]carbamate (0.5 g, 71.14%). |
71.14% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 10 tert-butyl N-[(2R)-l-(3-cyclopropylpyrrolidin-l-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate A solution of 3-cyclopropylpyrrolidine hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-l-(3- cyclopropylpyrrolidin-l-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl]carbamate (0.5 g, 71.14%). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64.3% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 11 tert-butyl N-[(2R)-l-(3-cyclopropylazetidin-l-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate A solution of 3-cyclopropylazetidine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.) (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N- [(2R)-l-(3-cyclopropylazetidin-l-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl]carbamate (0.45 g, 64.3% yield). |
64.3% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 11 tert-butyl N-[(2R)-l-(3-cyclopropylazetidin-l-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate A solution of 3-cyclopropylazetidine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.) (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2S04, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N- [(2R)-l-(3-cyclopropylazetidin-l-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl]carbamate (0.45 g, 64.3% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 12 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l- yl]propan-2-yl] carbamate A solution of l-(azetidin-3-yl)-lH-pyrazole hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3- (2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l-yl]propan-2-yl]carbamate (0.35 g, 50% yield). |
50% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 12 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l- yl]propan-2-yl] carbamate A solution of l-(azetidin-3-yl)-lH-pyrazole hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3- (2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l-yl]propan-2-yl]carbamate (0.35 g, 50% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 13 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l- yl]propan-2-yl] carbamate A solution of l-(azetidin-3-yl)-lH-pyrazole hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3- (2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l-yl]propan-2-yl]carbamate (0.35 g, 50% yield). |
50% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 13 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l- yl]propan-2-yl] carbamate A solution of l-(azetidin-3-yl)-lH-pyrazole hydrochloride (1 eq.), (R)-2-((tert- Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, concentrated in vacuo and purified by HPLC to afford tert-butyl N-[(2R)-3- (2,4-dichlorophenyl)-l-oxo-l-[3-(lH-pyrazol-l-yl)azetidin-l-yl]propan-2-yl]carbamate (0.35 g, 50% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
56.1% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 14 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-(3-phenylazetidin-l-yl)propan-2- yl] carbamate A solution of 3-phenylazetidine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-3-(2,4- di chi orophenyl)-l -oxo-1 -(3 -phenylazeti din- l-yl)propan-2-yl] carbamate (0.55 g, 56.1% yield). |
56.1% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 14 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-(3-phenylazetidin-l-yl)propan-2- yl] carbamate A solution of 3-phenylazetidine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-3-(2,4- di chi orophenyl)-l -oxo-1 -(3 -phenylazeti din- l-yl)propan-2-yl] carbamate (0.55 g, 56.1% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | Stage #1: (R)-2-(tert-butoxycarbonylamino)-3-(2,4-dichlorophenyl)propionic acid; 5-(azidomethyl)-2,3-dihydro-1H-isoindole hydrochloride With N-ethyl-N,N-diisopropylamine In N,N-dimethyl acetamide at -10℃; for 0.166667h; Stage #2: With N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 16 tert-butyl (R)-(l-(5-(aminomethyl)isoindolin-2-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl)carbamate A mixture of (R)-2-((tert-butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (3.4 g; 10 mmol), 5-(azidomethyl)-2,3-dihydro-li/-isoindole hydrochloride (2.1 g; 10 mmol),), and DIPEA (2.9 g; 22 mmol) in DMA (40 mL) was stirred at -10 °C for 10 min before HATU (4.65 g; 12 mmol) was added. The resulting mixture was stirred at r.t. overnight, diluted with water, and extracted with ethyl acetate. The organic layer was washed with water, dried over Na2SC>4, and concentrated under reduced pressure to obtain tert-butyl (R)-(l-(5-(azidomethyl)isoindolin-2-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl)carbamate (4.5 g; 90%). HPLC-MS (Positive mode) m/z [M-tBu]+ 434. NMR (500 MHz, DMSO- de) d 7.56 - 7.17 (m, 6H), 4.76 - 4.63 (m, 2H), 4.63 - 4.50 (m, 2H), 4.43 (d, J= 4.0 Hz, 4H), 3.07 (d, J = 12.5 Hz, 1H), 2.91 (t, J= 11.8 Hz, 1H), 1.21 (d, .7= 54.1 Hz, 9H). |
90% | Stage #1: (R)-2-(tert-butoxycarbonylamino)-3-(2,4-dichlorophenyl)propionic acid; 5-(azidomethyl)-2,3-dihydro-1H-isoindole hydrochloride With N-ethyl-N,N-diisopropylamine In N,N-dimethyl acetamide at -10℃; for 0.166667h; Stage #2: With N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 16 tert-butyl (R)-(l-(5-(aminomethyl)isoindolin-2-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl)carbamate A mixture of (R)-2-((tert-butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (3.4 g; 10 mmol), 5-(azidomethyl)-2,3-dihydro-li/-isoindole hydrochloride (2.1 g; 10 mmol),), and DIPEA (2.9 g; 22 mmol) in DMA (40 mL) was stirred at -10 °C for 10 min before HATU (4.65 g; 12 mmol) was added. The resulting mixture was stirred at r.t. overnight, diluted with water, and extracted with ethyl acetate. The organic layer was washed with water, dried over Na2SC>4, and concentrated under reduced pressure to obtain tert-butyl (R)-(l-(5-(azidomethyl)isoindolin-2-yl)-3-(2,4-dichlorophenyl)-l-oxopropan-2-yl)carbamate (4.5 g; 90%). HPLC-MS (Positive mode) m/z [M-tBu]+ 434. NMR (500 MHz, DMSO- de) d 7.56 - 7.17 (m, 6H), 4.76 - 4.63 (m, 2H), 4.63 - 4.50 (m, 2H), 4.43 (d, J= 4.0 Hz, 4H), 3.07 (d, J = 12.5 Hz, 1H), 2.91 (t, J= 11.8 Hz, 1H), 1.21 (d, .7= 54.1 Hz, 9H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | Stage #1: (R)-2-(tert-butoxycarbonylamino)-3-(2,4-dichlorophenyl)propionic acid With 4-methyl-morpholine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 0℃; for 0.166667h; Stage #2: 5-bromo-2,3-dihydro-1H-isoindole hydrochloride In N,N-dimethyl-formamide at 0 - 20℃; for 3h; | 1 tert-butyl N-[(2R)-l-(5-bromo-2,3-dihydro-lH-isoindol-2-yl)-3-(2,4- dichlorophenyl)-l-oxopropan-2-yl] carbamate To a solution of (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4- dichlorophenyl)propanoic acid (3.3 g, 9.7 mmol) in DMF (30 mL), cooled to 0 °C, were added HATU (4.4 g, 11.7 mmol) and N-methylmorpholine (3.4 g, 34 mmol) and the mixture was stirred for 10 min maintaining the temperature below 0 °C. After that, 5- Bromoisoindoline hydrochloride (2.28 g, 9.7 mmol) was added at the same temperature. The reaction mixture was stirred for 3 h at r.t. and poured onto ice (100 mL); the precipitated solid was collected, washed with water (3 c 70 mL), and dried to afford 4.6 g of compound tert- butyl N-[(2R)-l-(5-bromo-2,3-dihydro-lH-isoindol-2-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate (92% yield). |
92% | Stage #1: (R)-2-(tert-butoxycarbonylamino)-3-(2,4-dichlorophenyl)propionic acid With 4-methyl-morpholine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 0℃; for 0.166667h; Stage #2: 5-bromo-2,3-dihydro-1H-isoindole hydrochloride In N,N-dimethyl-formamide at 0 - 20℃; for 3h; | 1 tert-butyl N-[(2R)-l-(5-bromo-2,3-dihydro-lH-isoindol-2-yl)-3-(2,4- dichlorophenyl)-l-oxopropan-2-yl] carbamate To a solution of (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4- dichlorophenyl)propanoic acid (3.3 g, 9.7 mmol) in DMF (30 mL), cooled to 0 °C, were added HATU (4.4 g, 11.7 mmol) and N-methylmorpholine (3.4 g, 34 mmol) and the mixture was stirred for 10 min maintaining the temperature below 0 °C. After that, 5- Bromoisoindoline hydrochloride (2.28 g, 9.7 mmol) was added at the same temperature. The reaction mixture was stirred for 3 h at r.t. and poured onto ice (100 mL); the precipitated solid was collected, washed with water (3 c 70 mL), and dried to afford 4.6 g of compound tert- butyl N-[(2R)-l-(5-bromo-2,3-dihydro-lH-isoindol-2-yl)-3-(2,4-dichlorophenyl)-l- oxopropan-2-yl] carbamate (92% yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65.7% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 15 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(pyridin-2-yl)azetidin-l- y 1] propan-2-y 1] carbamate A solution of 2-(azetidin-3-yl)pyridine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.) (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-3-(2,4- dichlorophenyl)-l-oxo-l-[3-(pyridin-2-yl)azetidin-l-yl]propan-2-yl]carbamate (0.46 g,65.7% yield). |
65.7% | With N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide at 20℃; | 15 tert-butyl N-[(2R)-3-(2,4-dichlorophenyl)-l-oxo-l-[3-(pyridin-2-yl)azetidin-l- y 1] propan-2-y 1] carbamate A solution of 2-(azetidin-3-yl)pyridine hydrochloride (1 eq.), (R)-2-((tert-Butoxycarbonyl)amino)-3-(2,4-dichlorophenyl)propanoic acid (1 eq.) (1 eq.), HATU (1.3 eq.), and DIPEA (3 eq.) in DMF (5 mL) was stirred overnight at room temperature. Then the mixture was diluted with ethyl acetate, washed twice with water and once with brine, dried over Na2SC>4, filtered, and concentrated in vacuo to afford tert-butyl N-[(2R)-3-(2,4- dichlorophenyl)-l-oxo-l-[3-(pyridin-2-yl)azetidin-l-yl]propan-2-yl]carbamate (0.46 g,65.7% yield). |
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