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