(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 、
对甲苯磺酰氯 在
吡啶 、 4 A molecular sieve 作用下,
反应 36.0h,
以4.46 g的产率得到(4S,5S,6S)-4-(2,2-Dimethoxy-ethyl)-5-[(S)-1-hydroxy-2-(toluene-4-sulfonyloxy)-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