反应详情

N-[(3R)-1-(4-aminophenyl)pyrrolidin-3-yl]acetamide mono hydrochloride (Method 44, 3.31 g, 15 mmol), di-tert-butyl[(Z)-1H-pyrazol-1-ylmethylylidene]biscarbamate (5.91 g, 15 mmol) and triethylamine (4.17 ml, 30 mmol) in DCM (50 ml) were heated at 40° C. for 18 hours. After evaporation under reduced pressure, chromatography on silica gel with ethyl acetate/isohexane (50:50 to 100) gave di-tert-butyl[(E)-({4-[(3R)-3-(acetylamino)pyrrolidin-1-yl]phenyl}amino)methylylidene]biscarbamate, which was dissolved in DCM (80 ml) and treated with TFA (15 ml) at ambient temperature for 18 hours under nitrogen. After evaporation under reduced pressure, the residue was dissolved in MeOH (20 ml) and diluted with ether. The title compound was collected by filtration as an off white solid (1.79 g, 30% over two steps). NMR: 1.80 (s, 3H), 1.81-1.93 (m, 1H), 2.10-2.27 (m, 1H), 2.99-3.06 (m, 1H), 3.19-3.51 (m, 3H), 4.27-4.39 (m, 1H), 6.52 (d, 2H), 7.03 (d, 2H), 7.16 (s, 3H), 8.10 (d, 1H), 9.36 (s, 1H).

1. customAfter evaporation under reduced pressure, chromatography on silica gel with ethyl acetate/isohexane (50:50 to 100)