(1R,2S)-1-[[(2S,4R)-1-[(2S)-2-(cyclopentyloxycarbonylamino)-3,3-dimethylbutanoyl]-4-(2-ethoxy-7-methoxy-8-methylquinolin-4-yl)oxypyrrolidine-2-carbonyl]amino]-2-ethenylcyclopropane-1-carboxylic acid 在
三乙胺 、
氯甲酸异丁酯 作用下,
以
二氯甲烷 为溶剂,
反应 5.0h,
以62%的产率得到cyclopentyl N-[(2S)-1-[(2S,4R)-2-[(2S,3R)-2-ethenyl-7-oxo-6-oxa-4-azaspiro[2.4]hept-4-en-5-yl]-4-(2-ethoxy-7-methoxy-8-methylquinolin-4-yl)oxypyrrolidin-1-yl]-3,3-dimethyl-1-oxobutan-2-yl]carbamate