3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionamide 、
异氰酸乙酯 在
Silica gel 作用下,
以
甲苯 为溶剂,
反应 24.0h,
以Flash chromatography (Merck Silica gel 60, 230-400 mesh, 4/1 hexanes/ethyl acetate) afforded 1-[3-cyclopentyl-2(R)-(3,4-dichloro-phenyl)-propionyl]-3-ethyl-urea (54 mg, 42%) as a white foam的产率得到