α'-Methylation of (−)-carvone followed by bicycloannulation with vinyltriphenylphosphonium bromide gives a 59% yield of a tricycio[3.2.1.02,7]octan-6-one which can be converted to precursors of (−)-patchouli alcohol, (−)-seychellene and (−)-cycloseycbellene.
(-)-
香芹酮的α'-甲基化,然后与
乙烯基三苯基
溴化膦双环环化,可得到三聚[3.2.1.0 2,7 ] octan -6-的59%收率,可将其转化为(-)-广cho香醇的前体,(-)-seychellene和(-)-cycloseycbellene。