乙酸酐   、                                                                                      
(1S,4aS,5R,7S,7aS)-5,7-Dihydroxy-7-methyl-1-((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-trityloxymethyl-tetrahydro-pyran-2-yloxy)-1,4a,5,6,7,7a-hexahydro-cyclopenta[c]pyran-4-carboxylic acid methyl ester                                                                                                                                                                                              以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以10%的产率得到(1S,4aS,5R,7S,7aS)-5,7-Diacetoxy-7-methyl-1-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-trityloxymethyl-tetrahydro-pyran-2-yloxy)-1,4a,5,6,7,7a-hexahydro-cyclopenta[c]pyran-4-carboxylic acid methyl ester