Optically pure (+)-tricyclo[6.2.1.02,7]undec-2(7)-en-3-one was first prepared from (+)-tricyclo[6.2.1.02,7]undeca-4,9-dien-3-one in four steps. Conjugated addition occurred selectively from the methano-bridge side to give the 1,4-adduct which was converted into natural (+)-epi-β-santalene.
光学纯的(+)-
三环[6.2.1.02,7]十一碳-2(7)-烯-3-酮首先由(+)-
三环[6.2.1.02,7]十一碳-4,9-二烯-3-酮通过四个步骤制备而成。共轭加成从甲桥侧选择性发生,生成1,4-加合物,后者转化为天然(+)-表-β-
檀香烯。