tert-Butyl (3R)-3-[({[(Z)-1-amino-2-ethoxy-2-oxoethylidene]amino}oxy)carbonyl]-6-cyclohexylhexanoate 在
silica gel 、 Ethyl acetate pentane 作用下,
以
邻二甲苯 为溶剂,
反应 17.0h,
以to afford the title compound as a colourless oil (20.0 g)的产率得到ethyl 5-{(1R)-1-[2-(tert-butoxy)-2-oxoethyl]-4-cyclohexylbutyl)-1,2,4-oxadiazole-3-carboxylate