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CAS No. : | 1129-46-0 | MDL No. : | MFCD04038077 |
Formula : | C9H10O3 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | SXERGJJQSKIUIC-SSDOTTSWSA-N |
M.W : | 166.17 | Pubchem ID : | 643326 |
Synonyms : |
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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 |
---|---|---|
99% | With oxalyl dichloride; N,N-dimethyl-formamide; In dichloromethane; at 20℃; for 6h; | Oxalyl chloride (1.09 mL, 12.5 mmol) was added to a solution of acid (R)-5 (0.83 g, 5 mmol) and DMF (5 μL) in CH2Cl2 (20 mL). The reaction mixture was stirred at room temperature for 6 h, and then evaporated to dryness under reduced pressure. The residue was dried over P2O5 in vacuo to afford 0.92 g (99%) of compound (R)-2a as a yellowish oil, which had an unpleasant odor. Anal. Calcd for C9H9ClO2: C, 58.55; H, 4.91. Found: C, 58.78; H, 5.07. 1H NMR spectrum was identical to that published for racemic chloride 2a. 5 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | With sodium hydroxide; In ethanol; at 4 - 20℃; for 24h; | At first, 2 M NaOH (5.2 mL, 10.4 mmol) was added dropwise to a solution of compound (R)-4 (1.01 g, 5.2 mmol) in ethanol (20 mL) with stirring at 4 C. The reaction mixture was stirred at room temperature for 24 h, and then evaporated to dryness under reduced pressure. The residue was dissolved in water (40 mL), washed with ethyl ether (2 * 10 mL), acidified with 4 M HCl to pH 1-2 and extracted with ethyl ether (4 * 20 mL). The organic layers were washed with saturated aqueous NaCl (2 * 40 mL), dried over MgSO4, and evaporated to dryness under reduced pressure. The residue was recrystallized from hexane to yield 0.77 g (89%) of compound (R)-5 as a colorless solid, mp 86-88 C (hexane) (lit. 85-87 C, 12 83 C 13 ); [α]D20 = +16.2 (c 0.6, CHCl3) {lit. 13 [α]D20 = +19 (c 1.0, CHCl3)}. HPLC (Chiralpak AD, n-hexane-iPrOH-TFA 20:1:0.02): 95.6% ee. Anal. Calcd for C9H10O3: C, 65.05; H, 6.06. Found: C, 64.95; H, 6.24. 1H and 13C NMR spectra were identical to those published for (S)-5.14 |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
37% | In ethyl acetate; at 80℃; for 48h; | (S)-2-Phenoxypropionic acid (3.4Og, 20.5 mmol, 1 equiv) was added to a solution of 2-[3- (diisopropylamino)-l-phenylpropyl]-4-(2-hydroxyethyl)phenol (Example 9, 7.28g, 20.5 mmol, 1 equiv) in ethyl acetate. The mixture was heated at 80 0C for 2 days, upon which the mixture was cooled to room temperature, filtered and washed with ethyl acetate and dried in vacuo at 50 0C overnight to give the title compound as a white solid (3.9g, 7.48 mmol, 37% yield, 94% ee). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
76% | A solution of amine (RS)-1b (0.28g, 0.15mmol) and PhNEt2 (0.22g, 1.5mmol) in toluene (20mL) was added to a solution of acyl chloride 2a (1.84g, 10mmol) [obtained from scalemic acid (R)-3, 96.5% ee] in toluene (30mL). The reaction mixture was kept at room temperature for 24h and then evaporated to dryness under reduced pressure. Acetonitrile (20mL) and saturated aqueous Na2CO3 (20mL) were added to the residue and the reaction mixture was stirred vigorously for 1h, after which acetonitrile was removed under reduced pressure, and the aqueous solution was washed with chloroform (4×15mL), acidified with 4M HCl to pH 1-2 and extracted with chloroform (4×10mL). The organic layers were washed with saturated aqueous NaCl (4×20mL), dried over MgSO4 and evaporated to dryness under reduced pressure to afford 1.26g (76%) of acid (R)-5 as a colorless solid, mp 88-90C; [α]D20=+21.1 (c 1.0, CHCl3). HPLC (Chiralpak AD, n-hexane-iPrOH-TFA 20:1:0.02): 99.6% ee. Anal. Calcd for C9H10O3: C, 65.05; H, 6.06. Found: C, 65.18; H, 6.25. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92%; 94% | With hydrogenchloride; In water; acetic acid; at 90 - 95℃; for 20h; | A solution of acyl chloride (R)-2a (0.92g, 5mmol) in toluene (50mL) was added to a solution of amine 1c (1.65g, 10mmol) in toluene (50mL) under stirring at -20C. The reaction mixture was stirred at -20C for 24h, then successively washed with 4M HCl (2×50mL), saturated aqueous NaCl (3×100mL), 5% NaHCO3 (2×50mL) and H2O (2×100mL), dried over MgSO4, and evaporated to dryness under reduced pressure. The residue was recrystallized from n-hexane-ethyl acetate to afford 1.25g (80%) of amide (S,R)-6c (de >99.9% according to GC) as colorless crystals. Amide (S,R)-6c (1.25g, 4mmol) was dissolved in glacial acetic acid (9mL), after which concentrated HCl (9mL) was added to the resulting solution. The reaction mixture was heated at 90-95C for 20h, then cooled to room temperature, evaporated to half the volume, poured into 4M HCl (50mL) and extracted with ethyl acetate (3×10mL). The organic layers were washed with saturated aqueous NaCl (3×20mL), dried over MgSO4, and evaporated to dryness. The residue was purified by flash column chromatography on silica gel (n-hexane-ethyl acetate) to yield 0.62g (94%) of acid (R)-5 as colorless crystals, mp 84-86C, [α]D20=+21.1 (c 1.0, CHCl3). HPLC (Chiralpak AD, n-hexane-iPrOH-TFA 20:1:0.02): 99.4% ee. Anal. Calcd for C9H10O3: C, 65.05; H, 6.06. Found: C, 65.03; H, 6.21. 1H and 13C NMR spectra were identical to those published for (S)-5.14 The acidic aqueous layer was alkalized with Na2CO3 and extracted with benzene (3×10mL). The organic layers were washed with water (3×20mL), dried over Na2SO4, and evaporated to dryness under reduced pressure. The residue was purified by flash column chromatography on silica gel (from n-hexane-benzene to benzene) to afford 0.61g (92%) of amine (S)-1c as a colorless oil. [α]D20=-77.8 (c 1.0, CHCl3) {lit.15 [α]D20=-79.0 (c 1.2, CHCl3)}. HPLC (Chiralcel OD-H, n-hexane-iPrOH-MeOH 100:1:0.5): >99.9% ee. 1H and 13C NMR spectra were identical to those published for (S)-1c.15 HRMS (ESI) calcd for C9H12NS [M+H]+ 166.0685. Found: 166.0687. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48 g | In isopropyl alcohol;Reflux; | (Comparative Example 2) (±) -2- methylpiperazine 15.0g (0.15mol), (R) -2- phenoxypropionicacid 69.8 g (0.42 mol), was mixed 2-propanol 250 ml, heated to reflux the contents, lysis did.After dissolution, the solution was cooled overnight to 25 C. The resulting separated crystalswere dried to give crude diastereomeric salt 48.0 g. [Alpha] D: + 21.2 (C = 1.0, methanol). (In FIG. 2, 2 crystallization, 3 crystallization was described as) The crude diastereomeric salt of 2-propanol from twice recrystallized by, purified diastereomeric salt (R)-2-methylpiperazine three ((R) -2-phenoxypropionic acid) 41.3g. [Alpha] D: + 23.0 (C = 1.0, methanol) melting point 149 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
83% | To a solution of 154 mg (0.424 mmol) of ethyl 6,6-dimethyl-3-[1-(trimethylsilyl)cyclopropanecarboxamido]-5,6-dihydr opyrrolo[3,4-c]pyrazole-2(4H)-carboxylate synthesized in the similar manner as in Reference Example 46 and 0.38 ml (2.2 mmol) of DIPEA in 2 ml of dehydrated dichloromethane, a solution of the obtained concentration residue in 1 ml of dehydrated dichloromethane was added at 0C in a nitrogen atmosphere and then stirred for 1.5 hours with the temperature unchanged. Subsequently, 0.24 ml (2.2 mmol) of N,N-dimethylethane-1,2-diamine was added to the reaction solution at 0C and then stirred at room temperature for 2 hours. After the completion of the reaction, the reaction solution diluted with dichloromethane was washed with a 5% aqueous potassium bisulfate solution and then separated into an aqueous layer and an organic layer. The aqueous layer was subjected to extraction with dichloromethane twice, and then, all of the obtained organic layers were dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure. The obtained concentration residue was subjected to silica gel column chromatography (DIOL silica gel, elution solvent: n-hexane:ethyl acetate = 80:20 to 50:50 (V/V)), and a fraction containing the compound of interest was concentrated under reduced pressure. The obtained concentration residue was dissolved in ethyl acetate, then n-hexane was added, and the deposited solid was collected by filtration, washed with n-hexane, and then dried under reduced pressure to obtain 155 mg of the title compound (yield: 83%) as a white solid. Mass spectrum (CI, m/z): 441 [M+1]+. 1H-NMR spectrum (400 MHz, DMSO-d6) δ: 12.33 & 12.02 (br s, total 1H), 10.03 - 9.76 (m, 1H), 7.30 - 7.22 (m, 2H), 6.94 - 6.87 (m, 1H), 6.85 - 6.78 (m, 2H), 4.95 - 4.70 (m, 2H), 4.67 - 4.51 (m, 1H), 1.70 - 1.52 (m, 6H), 1.45 (d, J = 6.4 Hz, 3H), 0.98 (br s, 2H), 0.80 - 0.59 (m, 2H), 0.01 (br s, 9H). |
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