(5S,9S)-9-ethyl-9-methyl-3-phenyl-4,7-dioxaspiro[4.4]non-2-ene-1,6-dione 、
[S-(R*,S*)]-5-(1,5-dimethylhexen-4-yl)-2-methyl-1,3-cyclohexa-1,3-diene 在
2-萘乙酮 作用下,
以
二氯甲烷 为溶剂,
反应 8.0h,
以43%的产率得到(1S,2S,4S,4'S,6R,7S,8S)-4'-ethyl-4',11-dimethyl-8-[(2R)-6-methylhept-5-en-2-yl]-2-phenylspiro[3-oxatricyclo[5.4.0.02,6]undec-10-ene-4,3'-oxolane]-2',5-dione