Structure of 24985-85-1
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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| CAS No. : | 24985-85-1 |
| Formula : | C11H11NO3 |
| M.W : | 205.21 |
| SMILES Code : | O=C(C(N1)=CC2=C1C=CC(O)=C2)OCC |
| MDL No. : | MFCD00015458 |
| InChI Key : | WANAXLMRGYGCPC-UHFFFAOYSA-N |
| Pubchem ID : | 90677 |
| GHS Pictogram: |
|
| Signal Word: | Warning |
| Hazard Statements: | H302-H315-H319-H335 |
| Precautionary Statements: | P261-P305+P351+P338 |
| Num. heavy atoms | 15 |
| Num. arom. heavy atoms | 9 |
| Fraction Csp3 | 0.18 |
| Num. rotatable bonds | 3 |
| Num. H-bond acceptors | 3.0 |
| Num. H-bond donors | 2.0 |
| Molar Refractivity | 56.41 |
| TPSA ? Topological Polar Surface Area: Calculated from |
62.32 Ų |
| Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.81 |
| Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.25 |
| Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
2.05 |
| Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
1.09 |
| Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
2.22 |
| Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.88 |
| Log S (ESOL):? ESOL: Topological method implemented from |
-2.78 |
| Solubility | 0.344 mg/ml ; 0.00168 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| Log S (Ali)? Ali: Topological method implemented from |
-3.19 |
| Solubility | 0.131 mg/ml ; 0.000639 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-3.19 |
| Solubility | 0.131 mg/ml ; 0.000638 mol/l |
| Class? Solubility class: Log S scale |
Soluble |
| GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
| BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
Yes |
| P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
| CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
Yes |
| CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
| CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
| CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
| CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
| Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-5.95 cm/s |
| Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
| Ghose? Ghose filter: implemented from |
None |
| Veber? Veber (GSK) filter: implemented from |
0.0 |
| Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
| Muegge? Muegge (Bayer) filter: implemented from |
0.0 |
| Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
| PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
| Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
| Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
| Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.74 |
* 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 |
|---|---|---|
| 99% | With hydrogen;10% palladium on activated carbon; In ethanol; for 20h; | A solution of 5-benzyloxyindole-2-carboxylic acid ethyl ester (10 g, 34 mmol) in ethanol (250 mL) was treated with 10% Pd/C and hydrogenated under atmospheric pressure (double-walled balloon) for 20 h. The reaction mixture was diluted with EtOAc and filtered through Celite. Evaporation of the filtrate in vacuo gave the title compound as a tan solid (7 g, 99%). 1H NMR (400 MHz, CDCl3) delta 8.86 (br s, 1H), 7.29 (d, J=8.80 Hz, 1H), 7.11 (s, 1H), 7.06 (s, 1H), 6.94 (d, J=8.70 Hz, 1H), 4.83 (br s, 1H), 4.42 (q, J=7.09 Hz, 2H), 1.41 (t, J=7.08 Hz, 3H). |
| 99% | palladium-carbon; In ethanol; | a Ethyl 5-Hydroxyindole-2-carboxylate A solution of 5-benzyloxyindole-2-carboxylic acid ethyl ester (10 g, 34 mmol) in 250 mL of ethanol was treated with 10% Pd/C and hydrogenated under atmospheric pressure (double-walled balloon) for 20 h. The reaction mixture was diluted with EtOAc and filtered through Celite. Evaporation of the filtrate in vacuo gave the title compound as a tan solid (7 g, 99%). 1H NMR (400 MHz, CDCl3) delta 8.86 (br s, 1H), 7.29 (d, J=8.80 Hz, 1H), 7.11 (s, 1H), 7.06 (s, 1H), 6.94 (d, J=8.70 Hz, 1H), 4.83 (br s, 1H), 4.42 (q, J=7.09 Hz, 2H), 1.41 (t, J =7.08 Hz, 3H). |
| 99% | palladium-carbon; In ethanol; | a 5-Hydroxyindole-2-carboxylic Acid Ethyl Ester A solution of 5-benzyloxyindole-2-carboxylic acid ethyl ester (10 g, 34 mmol) in ethanol (250 mL) was treated with 10% Pd/C and hydrogenated under atmospheric pressure (double-walled balloon) for 20 h. The reaction mixture was diluted with EtOAc and filtered through Celite. Evaporation of the filtrate in vacuo gave the title compound as a tan solid (7 g, 99%). 1H NMR (400 MHz, CDCl3)·8.86 (br s, 1H), 7.29 (d, J=8.80 Hz, 1H), 7.11 (s, 1H), 7.06 (s, 1H), 6.94 (d, J=8.70 Hz, 1H), 4.83 (br s, 1H), 4.42 (q, J=7.09 Hz, 2H), 1.41 (t, J=7.08 Hz 3H). |
[ 24985-85-1 ]
[ 124-63-0 ]
[ 6780-49-0 ]
[ 24985-85-1 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| The product of claim 1 wherein said indole compound is selected from the group consisting of ... 7-hydroxy-3-methylindole, 5-hydroxy-6-methoxy-2,3-dimethylindole, 5-hydroxy-3-methylindole, 5-acetoxy-6-hydroxyindole, 5-hydroxy-2-ethoxycarbonylindole, 6-hydroxy-2-carboxy-5-methylindole, 6-hydroxy-2-ethoxycarbonyl-5-methoxyindole, 6-N-beta-hydroxyethylaminoindole, ... | ||
| The process of claim 1 wherein said indole colorant is selected from the group consisting of ... 4-hydroxyindole, 5-hydroxy-3-methylindole, 7-hydroxy-3-methylindole, 5-hydroxy-2-carboxyindole and 5-hydroxy-2-ethoxycarbonylindole. |
[ 24985-85-1 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 52% | With caesium carbonate; allyl bromide; In DMF (N,N-dimethyl-formamide); at 20℃; for 24.3h;Stirring; | To a solution of <strong>[24985-85-1]5-hydroxyindole-2-carboxylic acid ethyl ester</strong> (14.2 g, 68.5 mmol) in DMF (150 mL) was added cesium carbonate (26.8 g, 82.3 mmol). The resulting mixture was stirred at room temperature for 20 min followed by the addition of allyl bromide (5.94 mL, 68.5 mmol). The reaction mixture was stirred at room temperature for 24 h. The reaction was diluted with ethyl acetate, washed with H2O, brine and dried (Na2SO4). The solvent was removed in vacua and the resulting crude product was purified by flash column chromatography on silica gel (0-20% EtOAc/hexanes) to give the desired material as solid (8.9 g, 52%). LC/MS (ES+) m/e 248 [M+H]+. |
[ 24985-85-1 ]

[ 667422-92-6 ]| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 52% | With triethylamine; In dichloromethane; at 0 - 20℃; for 48h; | A suspension of <strong>[24985-85-1]5-hydroxy-2-carboxyindol ethyl ester</strong> (103 mg; 0.50 mmol) and triethylamine (56 mg, 0.55 mmol) in dichloromethane (10 mL) was added to a mixture of bis (3-isopropyl-4-methoxyphenyl) iodonium tetrafluoroborate (382 mg; 0.75 mmol) and Cu-bronze (64 mg; 1.0 mmol) in dichloromethane (10 mL) at [0C.] The reaction mixture was stirred at room temperature under nitrogen gas for 2 days. The reaction mixture was filtered through celite and washed with dichloromethane and concentrated. The residue was purified on column (silica gel, ethyl acetate/ petroleum ether 1: 9) to give 76 mg (52 %) of [5- (3-ISOPROPYL-4-METHOXYPHENOXY)-2-] carboxyindol ethyl ester. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 100% | With dmap; at 80℃; for 4h; | [00213] A stirred solution of <strong>[24985-85-1]ethyl 5-hydroxyindole-2-carboxylate</strong> (7.79 g) and 4-dimethylaminopyridine (20 mg) in acetic anhydride (80 ml) was heated at 80 C. for 4 hours. The reaction was concentrated in vacuo and the residue was dissolved in ethyl acetate. Combined organic extracts were washed with hydrochloric acid (2 M), saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo to yield the product as a yellow solid (9.39 g,100%). NMR: delta 1.20 (t, 3H), 2.10 (s, 3H), 4.19 (q, 2H), 6.86 (dd, 1H), 6.97 (d, 1H), 7.20 (s, 1H), 7.29 (d, 1H); m/z 248 (M+H+). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 82% | With boron tribromide; In dichloromethane; | Step 2: Ethyl 5-hydroxyindole-2-carboxylate. A mixture of 5.34 g (24.3 mmol) of ethyl 5-methoxyindole-2-carboxylate was stirred in 40 ml of CH2Cl2 at 0 C. under Ar while 40.0 ml of 1.0 M BBr3 in CH2Cl2 was added slowly over a period of 0.5 hour. The reaction mixture was stirred for 2 hours more at which time the reaction was complete. The mixture was extracted with EtOAc, washed with brine and water, dried (MgSO4), filtered, and concentrated. Flash column chromatography (30% EtOAc/hexane) yielded a pale-yellow solid (4.07 g, 82%): m.p. 142-144 C.; Rf 0.18 (20% EtOAc/hexane); 1H NMR (400 MHz, CDCl3) delta1.41 (t, J=7.2 Hz, 3, CH3), 4.40 (q, J=7.2 Hz, 2, CH2), 4.70 (s, 1, OH), 6.93 (dd, J=8.4, 1.6 Hz, 1, ArH), 7.06 (d, J=2.8 Hz, 1, ArH), 7.10 (s, 1, ArH), 7.29 (d, J=9.2 Hz, 1, ArH), 8.79 ppm (s, 1, NH). |
| 48% | With boron tribromide; In diethyl ether; dichloromethane; | i Ethyl 5-hydroxyindole-2-carboxylate Boron tribromide (64.58 g) was added dropwise to a stirred solution of ethyl 5-methoxyindole-2-carboxylate (20 g) in dichloromethane (1000 ml) at -78 C. under an atmosphere of argon. The reaction was allowed to warm to room temperature and stirred for a further 2 hours. The reaction was poured into ice/saturated aqueous sodium hydrogen carbonate solution with stirring and extracted with ethyl acetate. Combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo and the residue was purified by column chromatography using 0-60% diethyl ether: iso-hexane as eluent to yield product as a white solid (9.02 g, 48%). NMR(CD3SOCD3): delta 1.31 (t, 3H), 4.29 (q, 2H), 6.79 (dd, 1H), 6.90 (dd, 1H), 7.22 (d, 1H), 8.84 (s, 1H), 11.52 (brs, 1H); m/z 206 (MH+). |
| 48% | With boron tribromide; In diethyl ether; dichloromethane; | i) Ethyl 5-hydroxyindole-2-carboxylate Boron tribromide (64.58 g) was added dropwise to a stirred solution of ethyl 5-methoxyindole-2-carboxylate (20 g) in dichloromethane (1000 ml) at -78 C. under an atmosphere of argon. The reaction was allowed to warm to room temperature and stirred for a further 2 hours. The reaction was poured into ice/s aqueous sodium hydrogen carbonate solution with stirring and extracted with ethyl acetate. Combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo and the residue was purified by column chromatography using 0-60% diethyl ether, iso-hexane as eluent to yield product as a white solid (9.02 g, 48%). NMR: 1.31 (t, 3H), 4.29 (q, 2H), 6.79 (dd, 1H), 6.90 (dd, 1H), 7.22 (d, 1H), 8.84 (s, 1H), 11.52 (brs, 1H; m/z 206 M+H+). |
| 48% | With boron tribromide; In dichloromethane; at -78 - 20℃; for 2h; | [00211] Boron tribromide (64.58 g) was added dropwise to a stirred solution of ethyl 5-methoxyindole-2-carboxylate (20 g) in dichloromethane (1000 ml) at -78 C. under an atmosphere of argon. The reaction was allowed to warm to room temperature and stirred for a further 2 hours. The reaction was poured into ice/saturated aqueous sodium hydrogen carbonate solution with stirring and extracted with ethyl acetate. Combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo and the residue was purified by column chromatography using 0-60% diethyl ether: iso-hexane as eluent to yield product as a white solid (9.02 g, 48%). NMR: delta 1.31) (t, 3H), 4.29 (q, 2H), 6.79 (dd, 1H), 6.90 (dd. 1H), 7.22 (d, 1H), 8.84 (s, 1H), 11.52 (brs, 1H); m/z 206 (M+H+). |

| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With triethylamine; In 1,4-dioxane; at 70℃; for 2h; | A solution of ethyl 5-HYDROXY-LH-INDOLE-2-CARBOXYLATE (5.0 g, 24.4 mmol) in 1,4- dioxane (50 ml) was treated with triethylamine (6.7 ml, 36.6 mmol) followed by di-tert-butyl dicarbonate (8.0 g, 36.6 mmol) and heated to 70 C (caution: gas development). After 2 h, the reaction was completed-most of the solvent was removed in vacuo. The residue was dissolved in ethyl acetate (250 ml) and washed with 0. 5M aqueous HCI (100 ml), water, and brine. The organic phase was dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was suspended in hexane and the generated precipitate was filtered to provide ethyl N-BOC-5-HYDROXY-INDOLE-2-CARBOXYLATE (8.2 g, 28.3 mmol) as an off-white solid. | |
| With triethylamine; In 1,4-dioxane; at 70℃; for 2h; | Example 15; Synthesis of a compound of Formula (I) where Rl, R3, R(at), and R' are OMe, R2, R(at), and RIO are Me, R4 and R5 are OH, R9 is H, R¹¹ is CN, Y is CH2, and R¹2 is 5- (2-methoxyethoxy)indol-2-ylcarbonylamino (compound 45); Step 1; A solution of ethyl 5-hydroxy-IH-indole-2-carboxylate (5.0 g, 24.4 mmol) in 1,4- dioxane (50 mL) was treated with TEA (6.7 mL, 36.6 mmol) followed by di-tert-butyl dicarbonate (8.0 g, 36.6 mmol) and heated to 70 C (caution: gas development). After 2 hr - the reaction was completed - most of the solvent was removed in vacuo. The residue was dissolved in EtOAc (250 mL) and washed with 0.5N HCl (aq), H20, and brine. The organic phase was dried over Na2S04 and concentrated in vacuo. The residue was suspended in hexane and the generated precipitate was filtered off to provide ethyl N-Boc-5-hydroxy-indole- 2-carboxylate (8.2 g, 28.3 mmol) as an off-white solid. |
[ 35654-56-9 ]
[ 24985-85-1 ]
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 30% | With dmap; In o-xylene;Heating / reflux; | Compound 22: Ethyl 5-[(6,7-dimethoxy-4-quinolyl)oxy]-1H-2-indolecarboxylate; 5-Hydroxy-1H-2-indolecarboxylic acid (328 mg) was dissolved in ethanol (10 ml) to prepare a solution. Concentrated sulfuric acid was added to the solution, and the mixture was heated under reflux for 3 hr. The reaction solution was cooled to room temperature, an aqueous sodium hydrogencarbonate solution was then added thereto, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was then washed with saturated brine and was dried over anhydrous magnesium sulfate. The solvent was removed therefrom by distillation under the reduced pressure, and the residue was purified by column chromatography on silica gel using ethyl acetate-hexane to give ethyl 5-hydroxy-1H-2-indolecarboxylate (336 mg, yield 88%). 4-Chloro-6,7-dimethoxyquinoline (362 mg), ethyl 5-hydroxy-1H-2-indolecarboxylate (277 mg), and 4-dimethylaminopyridine (195 mg) were suspended in o-xylene, and the suspension was heated under reflux overnight. The reaction solution was cooled to room temperature, water was then added to the reaction solution, and the mixture was extracted with ethyl acetate. The ethyl acetate layer was then washed with saturated brine and was dried over anhydrous magnesium sulfate. The solvent was removed therefrom by distillation under the reduced pressure, and the residue was purified by column chromatography using ethyl acetate-hexane on silica gel to give the title compound (161 mg, yield 30%). 1H-NMR (CDCl3, 400 MHz): delta 1.43 (t, J = 7.1 Hz, 3H), 4.07 (s, 3H), 4.07 (s, 3H), 4.44 (q, J = 7.1 Hz, 2H), 6.43 (d, J = 5.4 Hz, 1H), 7.18 (dd, J = 2.2 Hz, 9.0 Hz, 1H), 7.24 (m, 1H), 7.47 (s, 1H), 7.50 - 7.52 (m, 2H), 7.64 (s, 1H), 8.46 (d, J = 5.4 Hz, 1H), 9.05 (s, 1H) Mass spectrometric value (ESI-MS, m/z): 393 (M+1)+ |
| With dmap; In toluene; at 180℃; for 2h;Microwave irradiation; | Example 105; 5- (6, 7-Dimethoxy-quinolin-4-yloxy)- 1H-indole-2-carboxylic acid (3- methoxy-phenyl)-amide; (a) 5- (6, 7-Dimethoxy-quinolin-4-yloxy)-lH-indole-2-carboxylic acid ethyl ester.; A mixture of 4-chloro-6, 7-dimethoxy-quinoline (0.4 g, 1.8 mmol), 5-hydroxy-lH-indole-2- carboxylic acid ethyl ester (0.37 g, 1.8 mmol, Biosynth AG) and DMAP (0.22 g, 1.8 mmol, Aldrich) in toluene (in a microwave tube) was heated in a microwave (Personal Chemistry, Emrys Optimizer) at 180 C for 2 h. The mixture was cooled to RT and diluted with 30 mL of EtOAc. The solution was washed with 10 mL of brine twice, dried over Na2SO4 and concentrated in vacuo. The residue was further purified with silica gel column chromatography (50% to 100% EtOAc in hexanes) to provide a white foam as the desired compound. MS (ESI pos. ion) m/z: 393 (M+H). Calc'd Exact Mass for C22H2oN20s : 392.40. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 74% | With potassium carbonate; In butanone; at 80℃; for 160h; | Example 194; (4.4- Difluoro-piperidin-1-yl)-{2:J 3-( methyl-propyl-amino )-propoxyl-1H -indol-2- yl} methanone as formic acid salt; a) Step 1: 5-(3-Chloro-propoxy)-lH-indole-2-carboxylic acid ethyl ester; To a solution of ethyl-5-hydroxyindole-2-carboxylate ( 15 g, 73 mmol, 1.0 eq. ) and 1- bromo-3-chloropropane (8.8 mL, 88 mmol, 1.2 eq. ) in 2-butanone (200 mL) was added potassium carbonate (12.1 g, 88 mmol, 1.2 eq. ). The reaction mixture was stirred 160 h at 80 C. The reaction mixture was cooled down and partitioned between ethyl acetate and water. The aqueous phase was extracted with ethyl acetate. The combined organic phases were washed with water and brine then dried over sodium sulfate, filtered and concentrated in vacuo. The crude mixture was purified by column chromatography on silica eluting with cyclohexane/ethyl acetate 9: 1 to yield 15.3 mg (74 %) of the title compound as a light yellow solid. MS (m/e): 282.7 (MH+, 100%). |
| 74% | With potassium carbonate; In butanone; for 96h;Heating / reflux; | Step 1: 5-(3-Chloro-propoxy)-1H-indole-2-carboxylic acid ethyl ester A mixture of ethyl-5-hydroxyindole-2-carboxylate (purchased at Biosynth, Ref H-6350, 15 g, 1.0 eq.), 1-bromo-3-chloropropane (8.8 mL, 1.2 eq.) and potassium carbonate (12.12 g, 1.2 eq.) in butanone (200 mL) was stirred 4 days at reflux. The reaction mixture was partitioned between ethyl acetate and water. The aqueous layer was extracted with ethyl acetate. The combined organic layers were washed with water and brine, evaporated in vacuo and purified on silica, eluding with a 19:1 to 2:1 gradient of cyclohexane/ethyl acetate to yield 15.3 g (74%) of the desired product as light yellow solid. MS (m/e): 282.5 (MH+, 100%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 44% | With tributylphosphine; 1,1'-azodicarbonyl-dipiperidine; In tetrahydrofuran; at 20℃; | Example 5; 5-(1-Isopropyl-pyrrolidin-3-yloxJr)-1H-indole-2-carbox7rlic acid cyclopropylmethyl- propyl-amide; a) Step 1: 5-(l-isopropyl-pyrrolidin-3-yloxy)-lH-indole-2-carboxylic acid ethyl ester; A mixture of 3.08 g (15 mmol) 5-hydroxy-lH-indole-2-carboxylic acid ethyl ester, 2.51 g (20 mmol) 1-isopropyl-3-pyrrolidinol and 8.7 ml (30 mmol) tri-N-butyl phospine in 75 ml was treated at room temperature with 7.57 g (30 mmol) 1,1'-(azodicarbonyl)- dipiperidine in 75 ml THF. The mixture was allowed to stir for a prolonged period of time and subsequently evaporated to dryness. The residue was suspended in 40 ml DCM/n- heptane 1/1, filtered and again washed with 40 ml DCM/n-heptane 1/1. The filtrate was evaporated and purified on silica eluting with a gradient of DCM/ 2N NH3 in methanol 99/1 to DCM/ 2N NH3 in methanol 93/7. The product fractions were evaporated and the residue was titurated with diethyl ether to yield after filtration, washing and drying of the residue at 50 C under vacuum 2.1 g (44 %) of the title compound as off-white solid. MS (m/e): 317.1 (MH+, 100%). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 49% | With tributylphosphine; 1,1'-azodicarbonyl-dipiperidine; at 0 - 20℃; | To a cold (0 C.) mixture of ethyl-5-hydroxyindole-2-carboxylate (purchased at Biosynth, H-6350, 20.5 g, 1.0 eq.), (R)-1-benzyl-3-pyrrolidinol (23 g, 1.3 eq.) and tri-n-butylphosphine (58 mL, 2.0 eq.) was slowly added 1,1'-(azodicarbonyl)dipiperidine (50.4 g, 2.0 eq.) in several portions. The reaction mixture was stirred at room temperature overnight and then filtered off. The filtrate was concentrated in vacuo and diethylether was added. The precipitate was filtered off and the filtrate was concentrated in vacuo and purified on silica eluding with dichloromethane/methanol/ammoniac. One fraction was isolated and dried in vacuo, to yield 18 mg (49%) of the desired product as light yellow foam. MS (m/e): 365.5 (MH+, 100%). |
| With tributylphosphine; 1,1'-azodicarbonyl-dipiperidine; In tetrahydrofuran; at 20℃; for 17h; | Example 135; J 5-( (S)-l- Isopropyl-pyrrolidin-3-yloxy)-lH -indol-2-yll-morphotin-4-yl-methanone; a) Step 1: 5-((S)-l-Benzyl-pyrrolidin-3-yloxy)-lH-indole-2-carboxylic acid ethyl ester; A mixture of 20.5 g (0.1 mol) ethyl-5-hydroxyindole-2-carboxylate, 23 g ( 0.13 mol) (R)-l-benzyl-pyrrolidine, 58 ml (0.2 mol) tri-n-butyl-phosphine and 50 g (0.2 mol) 1,1'- azodicarbonyl dipiperidine in 600 ml THF was stirred for 17 h at room temperature. The suspension was filtered and the filtrate was evaporated to dryness. The residue was taken up in 100 ml heptane/DCM 1/1 and the precipitate was filtered off and washed with 100 ml heptane/DCM 1/1. The filtrate was evaporated to dryness and the residue was taken up in 100 ml DCM and purified by flash column chromatography on silica eluting with a gradient of ethyl acetate/ heptane 1/3 to 2/1. The product containing fractions were pooled and evaporated to dryness and again purified on silica eluting with a gradient from DCM/ 2N NH3 in MeOH 99/1 to 19/1. 6.2g of pure product were obtained from pooling and evaporation of pure fractions. This was recrystallised from diethyl ether and heptane and washed with diethyl ether/ heptane to yield 3.5 g of pure product MS (m/e): 365.1 (MH+, 100%). 26 g of impure product were obtained from pooling and evaporation of the respective fractions. This was recrystallised from diethyl ether and heptane and washed with diethyl ether/ heptane to yield 9.0 g of pure product. All filtrates were pooled and evaporated to dryness to yield 14 g of slightly impure product which was used without further purification in the consecutive steps. |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 100% | With dmap; In acetic anhydride; ethyl acetate; | ii Ethyl 5-acetoxyindole-2-carboxylate A stirred solution of <strong>[24985-85-1]ethyl 5-hydroxyindole-2-carboxylate</strong> (7.79 g) and 4-dimethylaminopyridine (20 mg) in acetic anhydride (80 ml) was heated at 80 C. for 4 hours. The reaction was concentrated in vacuo and the residue was dissolved in ethyl acetate. Combined organic extracts were washed with hydrochloric acid (2 M), saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo to yield the product as a yellow solid (9.39 g,100%). NMR(CD3SOCD3): delta 1.20 (t, 3H), 2.10 (s, 3H), 4.19 (q, 2H), 6.86 (dd, 1H), 6.97 (d, 1H), 7.20 (s, 1H), 7.29 (d, 1H); m/z 248 (MH+). |
| 100% | With dmap; In acetic anhydride; ethyl acetate; | ii) Ethyl 5-acetoxyindole-2-carboxylate A stirred solution of <strong>[24985-85-1]ethyl 5-hydroxyindole-2-carboxylate</strong> (7.79 g) and 4-dimethylaminopyridine (20 mg) in acetic anhydride (80 ml) was heated at 80 C. for 4 hours. The reaction was concentrated in vacuo and the residue was dissolved in ethyl acetate. Combined organic extracts were washed with hydrochloric acid (2 M), saturated aqueous sodium hydrogen carbonate solution, water, aqueous saturated sodium chloride solution and dried. The solution was concentrated in vacuo to yield the product as a yellow solid (9.39 g, 100%). NMR: 1.20 (t, 3H), 2.10 (s, 3H), 4.19 (q, 2), 6.86 (dd, 1H), 6.97 (d, 1H), 7.20 (s, 1H), 7.29 (d, 1H); m/z 248 (M+H+). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| 74% | With pyridine; In dichloromethane; | Step 3: Ethyl 5-(trifluoromethanesulfonyloxy)indole-2-carboxylate. To a solution of 4.00 g (19.5 mmol) of <strong>[24985-85-1]ethyl 5-hydroxyindole-2-carboxylate</strong> and 4.0 ml (49.5 mmol) of pyridine in 40 ml of CH2Cl2 in a 0 C. ice bath under Ar, 4.2 ml (24.9 mmol) of trifluoromethanesulfonic anhydride was added slowly over a period of 0.5 hour. The reaction mixture was stirred for 4 hours, at which time the reaction was complete. The mixture was warmed to room temperature and extracted with EtOAc. The extract was washed with 10% HCl, 5% NaHCO3, brine, and water, dried (MgSO4), filtered, and concentrated to afford a yellow solid (4.89 g, 74% yield): m.p. 122-124 C.: Rf 0.38 (20% EtOAc/hexane); 1H NMR (400 MHz, CDCl3) delta1.43 (t, J=7.6 Hz, 3, CH3), 4.44 (q, J=7.6 Hz, 2, CH2), 7.23 (dd, J=9.6, 2.4 Hz, 1, ArH), 7.25 (d, J=2.0 Hz, 1, ArH), 7.47 (d, J=9.2 Hz, ArH), 7.61 (d, J=2.0 Hz, 1, ArH), 9.23 ppm (s, 1, NH). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| In dichloromethane; | Example 11 Ethyl 5-(tert-butyldimethylsiloxy)-1H-indole-2-carboxylate Imidazole (2.30 g, 33.2 mmol) and tert-butyldimethylsilyl chloride (2.50 g, 16.6 mmol) were added successively to a stirred solution of <strong>[24985-85-1]ethyl 5-hydroxy-1H-indole-2-carboxylate</strong> (1.70 g, 8.29 mmol) in dichloromethane (100 mL). The reaction was stirred for 16 h and then diluted with dichloromethane (300 mL). The solution was washed with water and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo to leave 2.65 g (100%) of Example 11. The product had: 1H NMR (300 MHz, acetone-D6) d 10.73-10.88 (br s, 1 H), 7.39 (d, 1 H), 7.11 (d, 1 H), 7.05 (s, 1 H), 6.86 (dd, 1 H), 4.34 (q, 2 H), 1.36 (t, 3 H), 1.09 (s, 9 H), 0.20 (s, 6 H). |
| Yield | Reaction Conditions | Operation in experiment |
|---|---|---|
| With triphenylphosphine; In tetrahydrofuran; hexane; ethyl acetate; | Example 220 Ethyl 5-[2-(5-methyl-2-phenyl-1,3-thiazol-4-yl)ethoxy]-1H-indole-2-carboxylate A solution of ethyl 5(hydroxy)-1H-indole-2-carboxylate (991 mg, 4.83 mmol) and 2-(5-methyl-2-phenyl-1,3-thiazol-4-yl)ethanol (1.06 g, 4.83 mmol) in tetrahydrofuran (30 +5 mL rinse) was added to a stirred mixture of triphenylphosphine (1.3 g, 4.9 mmol) and 1,1'-(azodicarbonyl)dipiperidine (1.2 g, 4.9 mmol) in tetrahydrofuran (10 mL). The reaction was stirred for 48 h and then diluted with ethyl acetate (200 mL). This solution was washed successively with water, 10% hydrochloric acid, and brine, dried over anhydrous magnesium sulfate, and concentrated in vacuo. Flash chromatography of the residue over silica gel using 25% ethyl acetate/hexane gave 1.04 g (53%) of the desired product. The product had: 1H NMR (300 MHz, acetone-D6) 10.40-10.55 (br s, 1 H), 7.89-7.95 (m, 2 H), 7.38-7.49 (m, 4 H), 7.19 (d, 1 H), 7.06-7.09 (m, 1 H), 6.95 (dd, 1 H), 4.30-4.40 (m, 4 H), 3.20 (t, 2 H), 2.51 (s, 3 H), 1.35 (t, 3 H); mass spectrometry gave MH+=407.1 (calc'd exact mass for C23H22N2O3S=406.14). The following compounds were prepared according to the method of Example 220: |

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