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铑和苯甲酸催化下对映选择性合成双环化合物
田中等人已经报道了以铑和苯甲酸为催化剂,将1,6-炔烯对映选择性环化异构合成二环[3.1.0]己烷。根据其结果,参加对映选择性环化异构反应的1,6-炔烯含有羰基,在烯炔联动前进中使用[Rh(cod)2]BF4, (S)-Segphos和苯甲酸为催化剂顺利获得2-烷基亚二环[3.1.0]己烷。二环[3.1.0]己烷骨架被视为天然产物的核心结构,因此,作为这类双环化合物合成的有效方法,该反应已经吸引了更多关注。此外,他们也已经报道了在1,6-炔烯对映选择性环化异构后使用甲苯磺酸促进内酯化的双环内酯合成一锅法反应。