二碳酸二叔丁酯 、 (R)-4-Acetylamino-6-((1S,2R)-1,2,3-triacetoxy-propyl)-5,6-dihydro-4H-pyran-2-carboxylic acid methyl ester 在
4-二甲氨基吡啶 作用下,
以
1,4-二氧六环 为溶剂,
生成 (4S,6R)-4-(Acetyl-tert-butoxycarbonyl-amino)-6-((1S,2R)-1,2,3-triacetoxy-propyl)-5,6-dihydro-4H-pyran-2-carboxylic acid methyl ester 、
(4R,6R)-4-(Acetyl-tert-butoxycarbonyl-amino)-6-((1S,2R)-1,2,3-triacetoxy-propyl)-5,6-dihydro-4H-pyran-2-carboxylic acid methyl ester