反应详情

A solution of 1.695 g (3.10 mmol) of methyl (2R)-(4-{2-[(tert-butoxycarbonyl)amino]ethoxy}phenyl){[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-ethanoate in 10 mL of diethylamine was stirred at room temperature for 2 h and then concentrated in vacuo. The residue was chromatographed on silica gel eluting with a gradient starting with ethyl acetate/hexanes (1:2) and ending with chloroform/methanol (9:1) to provide 0.717 g of methyl (2R)-amino(4-{2-[(tert-butoxycarbonyl)amino]-ethoxy}phenyl)ethanoate as a colorless oil. Electrospray Mass Spec 325.2 (M+H)+

1. concentrationconcentrated in vacuo
2. customThe residue was chromatographed on silica gel eluting with a gradient