(2S,5'S)-5'-[3-(9H-Fluoren-9-ylmethoxycarbonylamino)-2-hydroxy-propyl]-2,5'-diisobutyl-4-[(R)-3-methyl-1-(2-trimethylsilanyl-ethoxymethoxymethyl)-butyl]-3,4'-dioxo-2,3,4',5'-tetrahydro-[2,3']bipyrrolyl-1,1'-dicarboxylic acid diallyl ester 在
对甲苯磺酸 作用下,
以
四氢呋喃 、
甲醇 为溶剂,
以99%的产率得到(2S,5'S)-5'-[3-(9H-Fluoren-9-ylmethoxycarbonylamino)-2-hydroxy-propyl]-4-((R)-1-hydroxymethyl-3-methyl-butyl)-2,5'-diisobutyl-3,4'-dioxo-2,3,4',5'-tetrahydro-[2,3']bipyrrolyl-1,1'-dicarboxylic acid diallyl ester