(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