1-O-tert-butyl 2-O-methyl (2R,5R)-5-[(Z)-2-[(3,5-dichloro-4-methoxybenzoyl)amino]-3-methoxy-3-oxoprop-1-enyl]-2-[(S)-hydroxy-[(3S)-4-[(2-methylpropan-2-yl)oxycarbonyl]-1-oxa-4-azaspiro[4.5]decan-3-yl]methyl]pyrrolidine-1,2-dicarboxylate 在
三乙烯二胺 、
N-溴代丁二酰亚胺(NBS) 作用下,
以
氯仿 为溶剂,
以10%的产率得到1-O-tert-butyl 2-O-methyl (2R,5R)-5-[(Z)-1-bromo-2-[(3,5-dichloro-4-methoxybenzoyl)amino]-3-methoxy-3-oxoprop-1-enyl]-2-[(S)-hydroxy-[(3S)-4-[(2-methylpropan-2-yl)oxycarbonyl]-1-oxa-4-azaspiro[4.5]decan-3-yl]methyl]pyrrolidine-1,2-dicarboxylate