2',3',4'-Triacetyl-6'-tritylswerosid 、
3,4-di-O-acetyl-1,2-exo-cyanoethylidene-β-L-rhamnose 在
triphenylmethyl perchlorate 作用下,
以
二氯甲烷 为溶剂,
以33%的产率得到Acetic acid (2S,3R,4S,5R,6R)-4,5-diacetoxy-2-((3S,4R,4aS)-8-oxo-4-vinyl-4,4a,5,6-tetrahydro-3H,8H-pyrano[3,4-c]pyran-3-yloxy)-6-((2R,3R,4R,5S,6S)-3,4,5-triacetoxy-6-methyl-tetrahydro-pyran-2-yloxymethyl)-tetrahydro-pyran-3-yl ester