(E)-3-[(2S,3R)-3-((2S,3R,4S,5R)-3-Acetoxy-5-ethyl-4-hydroxy-2,4-dimethyl-tetrahydro-furan-2-yl)-oxiranyl]-acrylic acid ethyl ester                                                                                                                                                              在
                                                                                                                                         
对甲苯磺酸                                                                                                                                                                          作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以90%的产率得到(E)-3-((1S,3R,4R,5S,7R,8S)-8-Acetoxy-7-ethyl-4-hydroxy-1,5-dimethyl-2,6-dioxa-bicyclo[3.2.1]oct-3-yl)-acrylic acid ethyl ester