(2R,3S,4S,5R,6R)-3,5-Bis-benzyloxy-2-benzyloxymethyl-6-((2S,3S,4S,5R,6R)-2,3,5-tris-benzyloxy-6-benzyloxymethyl-tetrahydro-pyran-4-yloxy)-tetrahydro-pyran-4-ol 、 [(2S,3S,4R,5S,6S)-3,4,5-triacetyloxy-6-[(2R,3R,4S,5R,6R)-4,5-diacetyloxy-6-(acetyloxymethyl)-2-bromooxan-3-yl]oxyoxan-2-yl]methyl acetate 在
4 A molecular sieve 、
silver trifluoromethanesulfonate 作用下,
以
1,2-二氯乙烷 为溶剂,
以59%的产率得到