(1R,4S)-4-hydroxy-cyclopent-2-ene-1,2-dicarboxylic acid 2-methyl ester 、 tert-butyl (1R,2S)-1-amino-2-vinylcyclopropanecarboxylate 在
tertbutyl 2-aminopentanoate 作用下,
以provided the title compound as a slightly yellow oil (50 mg, 38%)的产率得到cis-5-[((1R,2S)-1-tert-butoxycarbonyl-2-vinylcyclopropyl)carbamoyl]-3-hydroxycyclopent-1-enecarboxylic acid methyl ester