苯甲醛二甲缩醛 、
[(2R,3S,4R,5R,6S)-6-ethenyl-3,4-dihydroxy-6-methyl-5-phenylmethoxyoxan-2-yl]methyl 4-methylbenzenesulfonate 在
D(+)-10-樟脑磺酸 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以75%的产率得到[(3aR,4R,6S,7R,7aR)-6-ethenyl-6-methyl-2-phenyl-7-phenylmethoxy-3a,4,7,7a-tetrahydro-[1,3]dioxolo[4,5-c]pyran-4-yl]methyl 4-methylbenzenesulfonate