(1S,2R,3S,4R,5R)-5-benzoyloxymethyl-1-(3-toluoyloxymethyl)-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid dibenzyl ester                                                                                                                                                              在
                                                                                                                                                                                 palladium 10% on activated carbon   、                                                                                                  
氢气   、                                                                                                  
乙酸酐                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙酸乙酯                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                生成                                                 
(1S,2R,3S,4R,5R)-5-benzoyloxymethyl-1-(4-toluoyloxymethyl)-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic anhydride