反应详情

2,5-Dioxopyrrolidin-1-yl(2-(trimethylsilyl)ethyl) carbonate (5.44 g, 20.99 mmol) was added to a mixture of ethyl 2-((2-((tert-butoxycarbonyl)amino)ethyl)amino)acetate (intermediate 126, 4.70 g, 19.08 mmol) and K2CO3 (5.80 g, 42.0 mmol) in DCM (60 ml) and water (30 ml) at room temperature. The reaction mixture was vigorously stirred for 20 h at room temperature, partitioned between saturated aqueous NaHCO3 solution and DCM, the mixture extracted with DCM (2×), the combined organic layers dried over Na2SO4 and evaporated to give the title compound as a yellow solid. 1H NMR (400 MHz, DMSO-d6) δ 6.71 (d, br, 1H), 4.16-3.93 (m, 6H), 3.30-3.21 (m, 2H), 3.09-3.00 (m, 2H), 1.37 (s, 9H), 1.19 (t, 3H), 0.99-0.94 (m, 1H), 0.90-0.85 (m, 1H), 0.05 (s, 9H).

1. custompartitioned between saturated aqueous NaHCO3 solution and DCM
2. extractionthe mixture extracted with DCM (2×)
3. dry with materialthe combined organic layers dried over Na2SO4
4. customevaporated