反应详情

A solution of the product from Example AH (3-(4-benzyloxy-phenyl)-2-{2-[(9H-fluoren-9-ylmethyl)-amino]-4-methyl-pentanoylamino}-propionic acid tert-butyl ester) (12.2 g, 20.0 mmol) in 500 mL of tetrahydrofuran was treated with piperidine (80 mL). The resulting solution was stirred at room temperature for 48 hours. The reaction mixture was concentrated and the residue purified by chromatography (silica gel, gradient elution EtOAc—15% EtOH/EtOAc). The resulting yellow solid was broken up in heptane to give the title compound as a white solid (6.77 g, 77%), mp=56-60° C.

1. concentrationThe reaction mixture was concentrated
2. customthe residue purified by chromatography (silica gel, gradient elution EtOAc—15% EtOH/EtOAc)