[(1S,3R,6S,7R,9S,12R,14S,15R)-15-[dimethyl(prop-2-enyl)silyl]oxy-7,14-bis(ethenyl)-2,8,13-trioxatricyclo[10.5.0.03,9]heptadecan-6-yl]oxy-dimethyl-prop-2-enylsilane                                                                                                                                                              在
                                                                                                                                         Cl
2P(Cy
3P)2=CHPh                                                                                                                                                                          作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以93%的产率得到meso-(5aR,6aS,8aR,9aS,14aR,16aS,17aR,19aS)-2,2,13,13-Tetramethyl-2,3,5a,6a,7,8,8a,9a,12,13,14a,15,16,16a,17a,18,19,19a-octahydro-1,6,9,14,17-pentaoxa-2,13-disiladiheptalen[2,3-b,2,3-f]oxepine