tert-butyl (3a'R,6a'S)-1'-(diethylcarbamoyl)-2'-oxohexahydro-4'H-spiro[cyclobutane-1,3'-pyrrolo[3,2-b]pyrrole]-4'-carboxylate 在
N,N-二异丙基乙胺 、
三氟乙酸 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
二氯甲烷 、
乙腈 为溶剂,
生成
tert-butyl N-[(1S)-1-[(3aS,6aR)-4-(diethylcarbamoyl)-5-oxo-spiro[2,3,3a,6a-tetrahydropyrrolo[3,2-b]pyrrole-6,1'-cyclobutane]-1-carbonyl]-2-methyl-propyl]carbamate