4-bromo-2-methyl-2-(triethylsilyloxy)butane 、
(2S)-2-[(1S,2R,5R,6R,9R,10R,13S,15S)-13-[tert-butyl(dimethyl)silyl]oxy-6,10-dimethyl-17,19-dioxo-18-phenyl-16,18,20-triazahexacyclo[13.5.2.01,9.02,6.010,15.016,20]docos-21-en-5-yl]propanal 在
碘 、
magnesium 作用下,
以
乙醚 、
四氢呋喃 为溶剂,
以83%的产率得到(1S,2R,5R,6R,9R,10R,13S,15S)-13-[tert-butyl(dimethyl)silyl]oxy-5-[(2S,3S)-3-hydroxy-6-methyl-6-triethylsilyloxyheptan-2-yl]-6,10-dimethyl-18-phenyl-16,18,20-triazahexacyclo[13.5.2.01,9.02,6.010,15.016,20]docos-21-ene-17,19-dione