(1aR,2aR,6R,6aR,7S,7aS)-6-Allyl-7-hydroxy-6a-hydroxymethyl-1a,6-dimethyl-hexahydro-1,3-dioxa-cyclopropa[b]naphthalen-5-one 、
2,2-二甲氧基丙烷 在
4-甲基苯磺酸吡啶 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 18.0h,
以67%的产率得到(+/-)-(4aα,8aα)-4a,5,6,7,8,8a-hexahydro-4α-allyl-4a-hydroxymethyl-5α-hydroxy-6,7α-epoxy-4,7-dimethyl-2H-1-benzopyran-3(4H)-one acetonide