反应详情

A solution of (2-methylsulfanyl-4,5-dihydro-3H-benzo[b]azepin-8-yl)-carbamic acid tert-butyl ester (2.2 g, 7.2 mmol) and 2,2-dimethoxyethanamine (1.0 g, 9.5 mmol) in ethanol (200 mL) was heated in an oil bath at 100° C. for 14 hours. The mixture was concentrated and purified by silica gel chromatography with DCM/MeOH (9:1) to give [2-(2,2-dimethoxy-ethylamino)-4,5-dihydro-3H-benzo[b]azepin-8-yl]-carbamic acid tert-butyl ester (1.6 g, 4.4 mmol, 61%): 1H NMR (300 MHz, CDCl3) δ 7.1 (m, 2H), 6.93 (s, 1H), 6.48 (s, 1H), 4.69 (t, 1H), 3.66 (d, 2H), 3.54 (s, 6H), 2.61 (t, 2H), 2.2 (br, 4H), 1.61 (s, 9H); MS (m/e) 364 (M+1).

1. concentrationThe mixture was concentrated
2. custompurified by silica gel chromatography with DCM/MeOH (9:1)