acetic acid (2S,3R,4S,5R,6R)-5-(tert-butyl-dimethyl-silanyloxy)-3-iodo-4-methoxy-6-methyl-tetrahydropyran-2-yl ester 、
(2S,3S,4R,5R,6R)-5-iodo-6-(4-methoxy-benzyloxy)-2,4-dimethyl-tetrahydropyran-3,4-diol 在
4 A molecular sieve 、
叔丁基二甲硅基三氟甲磺酸酯 作用下,
以
二氯甲烷 为溶剂,
反应 2.5h,
以60%的产率得到(2S,3S,4R,5R,6R)-3-[(2S,3R,4S,5R,6R)-5-(tert-butyl-dimethyl-silanyloxy)-3-iodo-4-methoxy-6-methyl-tetrahydropyran-2-yloxy]-5-iodo-6-(4-methoxy-benzyloxy)-2,4-dimethyl-tetrahydropyran-4-ol