chloro isopropylformate 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
以84%的产率得到(E)-(4S,5R,8R)-4-Hydroxy-8-((3bS,6R,8aS,8bS,10aR)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-5-methyl-non-6-en-2-ynoic acid isopropyl ester