(5S,9R,11R,E)-methyl 9-hydroxy-3-methyl-7-oxo-11-(prop-1-en-2-yl)-6,16-dioxatricyclo[11.2.1.15,8]heptadeca-1(15),2,8(17),13-tetraene-14-carboxylate                                                                                                                                                                                              以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                    反应 0.67h,
                                                                                                                以85%的产率得到(2R,3R,7R,9S)-methyl 7-hydroxy-5-oxo-2,9-di(prop-1-en-2-yl)-4,14-dioxatricyclo[9.2.1.13,6]pentadeca-1(13),6(15),11-triene-12-carboxylate