3-氟-2-吗啉苯甲醛

反应条件: temp:75.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 3-((R)-2-cyclohexyl-6-oxo-piperazin-1-yl)-5-phenyl-thiophene-2-carboxylic acid (50.0 mg, 0.13 mmol, 1.0 equiv) and 3-fluoro-2-morpholinobenzaldehyde (108.8 mg, 0.52 mmol, 4.0 equiv) in acetic acid (0.2 mL) and methanol (0.5 mL) was stirred at room temperature for 60 minutes. Then sodium triacetoxyborohydride (110.2 mg, 0.52 mmol, 4.0 equiv) was added to the mixture and the resulting mixture was stirred at 75° C. for 3 hours. The solvent was removed by Genevac and the residue was dissolved in EtOAc (6 mL). The organic phase was washed by brine (3 mL), dried over Na2SO4 and concentrated. The residue was purified by HPLC (0.1% NH4OH) to afford the product (9 mg, 12%). MS: 577.2 [M−H+]. The solvent was removed by Genevac the residue was dissolved in EtOAc (6 mL) The organic phase was washed by brine (3 mL) dried over Na2SO4 concentrated The residue was purified by HPLC (0.1% NH4OH)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A 50 mL round-bottom flask was charged with 3-fluoro-2-(morpholin-4-yl)benzaldehyde (0.500 g, 2.39 mmol, 1.00 equiv), tert-butyl piperazine-1-carboxylate (404 mg, 2.17 mmol, 0.91 equiv), dichloromethane (10 mL). The mixture was stirred at room temperature for 0.5 hour. Sodium triacetoxyborohydride (1.38 g, 6.51 mmol, 2.72 equiv) was added. The resulting solution was stirred overnight at room temperature and diluted with dichloromethane. The resulting mixture was washed with H2O (3×10 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3) to yield 1.00 g (crude) of tert-butyl 4-[[3-fluoro-2-(morpholin-4-yl)phenyl]methyl]piperazine-1-carboxylate as colorless oil. LCMS (ESI, m/z): 380 [M+H]+. The resulting solution was stirred overnight at room temperature The resulting mixture was washed with H2O (3×10 mL) dried over anhydrous sodium sulfate filtered concentrated under reduced pressure The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3)

反应条件: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A 100 mL round-bottom flask was charged with 2,3-difluorobenzaldehyde (2.00 g, 14.1 mmol, 1.00 equiv), morpholine (1.84 g, 21.1 mmol, 1.50 equiv), potassium carbonate (4.90 g, 35.4 mmol, 2.52 equiv), and dimethyl sulfoxide (20 mL). The resulting solution was stirred overnight at 100° C. in an oil bath and diluted with H2O (50 mL). The resulting solution was extracted with dichloromethane (3×20 mL) and the organic layers were combined, washed with H2O (3×50 mL), dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/20) to yield 0.840 g (28% yield) of 3-fluoro-2-(morpholin-4-yl)benzaldehyde as a yellow solid. 1H NMR 300 MHz, (CDCl3) δ 10.54 (s, 1H), 7.63 (d, J=7.5 Hz, 1H), 7.18-7.34 (m, 2H), 3.85 (br, 4H), 3.23 (br, 4H). LCMS (ESI, m/z): 210 [M+H]. The resulting solution was extracted with dichloromethane (3×20 mL) washed with H2O (3×50 mL) dried over anhydrous sodium sulfate filtered concentrated under reduced pressure The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/20)

反应条件: temp:75.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 3-((R)-2-cyclohexyl-6-oxo-piperazin-1-yl)-5-phenyl-thiophene-2-carboxylic acid (50.0 mg, 0.13 mmol, 1.0 equiv) and 3-fluoro-2-morpholinobenzaldehyde (108.8 mg, 0.52 mmol, 4.0 equiv) in acetic acid (0.2 mL) and methanol (0.5 mL) was stirred at room temperature for 60 minutes. Then sodium triacetoxyborohydride (110.2 mg, 0.52 mmol, 4.0 equiv) was added to the mixture and the resulting mixture was stirred at 75° C. for 3 hours. The solvent was removed by Genevac and the residue was dissolved in EtOAc (6 mL). The organic phase was washed by brine (3 mL), dried over Na2SO4 and concentrated. The residue was purified by HPLC (0.1% NH4OH) to afford the product (9 mg, 12%). MS: 577.2 [M−H+]. The solvent was removed by Genevac the residue was dissolved in EtOAc (6 mL) The organic phase was washed by brine (3 mL) dried over Na2SO4 concentrated The residue was purified by HPLC (0.1% NH4OH)