(3R,5S)-5-(methoxycarbonyl)pyrrolidin-3-yl 4-vinyl-1,3-dihydro-2H-isoindole-2-carboxylate hydrochloride 、
(2S)-cyclohexyl{[(pent-4-en-1-yloxy)carbonyl]amino}acetic acid 在
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以73%的产率得到(3R,5S)-1-((2S)-2-cyclohexyl-2-{[(pent-4-en-1-yloxy)carbonyl]-amino}acetyl)-5-(methoxycarbonyl)pyrrolidin-3-yl 4-vinyl-1,3-dihydro-2H-isoindole-2-carboxylate