methyl (1R,2R,5S,6R,8S,9S,10R,11S,12S)-12-acetyloxy-5,11-dimethyl-6-methylsulfonyloxy-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadec-13-ene-9-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
2,3,5-三甲基吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 9.5h,
                                                                                                                以34%的产率得到methyl (1R,2R,5S,8S,9S,10R,11S,12S)-12-acetyloxy-5,11-dimethyl-16-oxo-15-oxapentacyclo[9.3.2.15,8.01,10.02,8]heptadeca-6,13-diene-9-carboxylate