(3aR-(1(1S*,3(R*),5R*,6R*),3aα,6α,7aβ))-1-((3-(2-hydroxy-1-(2-methoxy-6-methylphenyl)ethyl)-8-methyl-2,4-dioxo-3,8-diazabicyclo(3.2.1)oct-6-yl)carbonyl)hexahydro-8,8-dimethyl-2,2-dioxo-3H-3a,6-methano-2,1-benzisothiazole 在
N-溴代丁二酰亚胺(NBS) 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 、
氯仿 为溶剂,
生成
(2-{(R)-1-[(1R,5S,6R)-6-((1R,5S,7S)-10,10-Dimethyl-3,3-dioxo-3λ6-thia-4-aza-tricyclo[5.2.1.01,5]decane-4-carbonyl)-8-methyl-2,4-dioxo-3,8-diaza-bicyclo[3.2.1]oct-3-yl]-2-methoxymethoxy-ethyl}-3-methoxy-benzyl)-triphenyl-phosphonium; bromide