(4S,5S,6S)-5-((R)-1,2-Dihydroxy-ethyl)-4-(2,2-dimethoxy-ethyl)-6-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  4 A molecular sieve   、                                                                                                  
1,5-Diazabicyclo[5.4.0]undec-5-ene                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 38.5h,
                                                                                                                生成                                                 
(4S,5S,6S)-4-(2,2-Dimethoxy-ethyl)-5-(R)-oxiranyl-6-((2S,3R,4S,5R,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-5,6-dihydro-4H-pyran-3-carboxylic acid methyl ester