(3S)-3-methyl-4-trityloxybut-1-ene   、                                                                                      
methyl (3S)-3-[tert-butyl(dimethyl)silyl]oxy-5-[(4S,5R)-5-ethenyl-2,2,4-trimethyl-1,3-dioxolan-4-yl]pentanoate                                                                                                                                                              在
                                                                                                                                                                                 
Hoveyda-Grubbs catalyst second generation                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 38.0h,
                                                                                                                以76%的产率得到(S)-3-(tert-butyl-dimethyl-silanyloxy)-5-[(4S,5R)-2,2,4-trimethyl-5-((E)-(R)-3-methyl-4-trityloxy-but-1-enyl)-[1,3]dioxolan-4-yl]-pentanoic acid methyl ester