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