丙二酸环(亚)异丙酯   、                                                                                      
methyl (3aR,5R,7R,7aS)-7-hydroxy-2-phenyl-5-phenylmethoxy-4,6,7,7a-tetrahydro-3aH-1,3-benzodioxole-5-carboxylate                                                                                                                                                                                              以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 3.5h,
                                                                                                                以79%的产率得到3-[[(3aR,4R,6S,7aR)-6-methoxycarbonyl-2-phenyl-6-phenylmethoxy-4,5,7,7a-tetrahydro-3aH-1,3-benzodioxol-4-yl]oxy]-3-oxopropanoic acid