allyl 2-deoxy-3-O-(2,2,2-trichloroethoxycarbonyl)-2-(2,2,2-trichloroethoxycarbonylamino)-α-D-glucopyranoside   、                                                                                      
(2R,3S,4S,5S,6R)-4,5-Diacetoxy-2-chloro-6-((R)-1,2-diacetoxy-ethyl)-3-phenylsulfanyl-tetrahydro-pyran-2-carboxylic acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
disodium hydrogenphosphate   、                                                                                                  4 A molecular sieve   、                                                                                                  
silver trifluoromethanesulfonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,2-二氯乙烷   、                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                                                        以45%的产率得到methyl (2S,3S,4S,5S,6R)-4,5-diacetyloxy-6-[(1R)-1,2-diacetyloxyethyl]-2-[[(2R,3S,4R,5R,6S)-3-hydroxy-6-prop-2-enoxy-5-(2,2,2-trichloroethoxycarbonylamino)-4-(2,2,2-trichloroethoxycarbonyloxy)oxan-2-yl]methoxy]-3-phenylsulfanyloxane-2-carboxylate