反应详情

温度

80 °C

A solution of diamine 248 (1.88 g, 11.2 mmol) in pyridine (20 mL) was treated with methyl isothiocyanate (970 mg, 12.9 mmol) and the mixture was stirred at 80° C. for 30 minutes, cooled down to 15° C., treated with solid EDC (3.03 g, 15.8 mmol, 1.40 eq) and the heating continued at 80° C. for 16 h. After removal of pyridine in vacuo, the residue was purified by flash chromatography (eluent 5% MeOH in CH2Cl2) to afford the title compound 268 (1.44 g, 62% yield). 1H NMR: (CD3OD) δ (ppm): 8.12 (d, J=2.2 Hz, 1H), 7.94 (dd, J=2.2, 8.8 Hz, 1H), 7.04 (d, J=8.8 Hz, 1H), 4.44 (bs, 2H), 3.51 (s, 3H), 3.04 (s, 3H). LRMS: (calc.) 206.2; (obt.) 207.1 (MH)+.

1. temperaturecooled down to 15° C.
2. waitthe heating continued at 80° C. for 16 h
3. customAfter removal of pyridine in vacuo
4. customthe residue was purified by flash chromatography (eluent 5% MeOH in CH2Cl2)