反应详情

To a solution of 0.30 g (0.65 mmol) 2-(4-{(S)-[(tert-butylsulfinyl)amino][5-(2,2,2-trifluoroethoxy)pyridin-2-yl]methyl}-1H-1,2,3-triazol-1-yl)-2-methylpropanoic acid in 2.5 ml toluene and 0.81 ml MeOH at rt was added 1.3 ml (2.6 mmol) 2.0 M TMS-diazomethane in hexanes. After 4 h at room temperature, the reaction mixture was concentrated in vacuo. Purification by flash chromatography (silica gel, linear gradient 0-15% MeOH in CH2Cl2) afforded 0.12 g (38%) methyl 2-(4-{(S)-[(tert-butylsulfinyl)amino][5-(2,2,2-trifluoroethoxy)pyridin-2-yl]methyl}-1H-1,2,3-triazol-1-yl)-2-methylpropanoate. ES-MS [M+1]+=478.2. 1H NMR (CDCl3, 400 MHz) δ 8.29 (d, J=2.75 Hz, 1H), 7.59 (s, 1H), 7.48 (d, J=8.70 Hz, 1H), 7.24 (m, 1H); 5.87 (d, J=5.31 Hz, 1H,), 5.33 (d, J=5.31 Hz, 1H), 4.38 (q, J=7.70, 2H), 3.71 (d, J=0.82 Hz, 1H); 1.92 (d, J=1.65 Hz, 6H); 1.27 (s, 9H).

1. concentrationthe reaction mixture was concentrated in vacuo
2. customPurification by flash chromatography (silica gel, linear gradient 0-15% MeOH in CH2Cl2)