1,2-O-benzylidene-4,6-O-ethylidene-glucopyranose 、
Benzoic acid (2R,4aR,6R,7R,8S,8aR)-6-bromo-8-(2-chloro-acetoxy)-2-methyl-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl ester 在
silver trifluoromethanesulfonate 作用下,
以84%的产率得到Benzoic acid (2R,4aR,6S,7R,8S,8aR)-8-(2-chloro-acetoxy)-2-methyl-6-((3aR,4aR,7R,8aR,9S,9aR)-7-methyl-2-phenyl-hexahydro-[1,3]dioxolo[4',5':5,6]pyrano[3,2-d][1,3]dioxin-9-yloxy)-hexahydro-pyrano[3,2-d][1,3]dioxin-7-yl ester