The present manuscript describes a convenient, mild, and highly stereoselective method for the allylation of δ-hydroxy-α,β-unsaturated ketones having a benzylic hydroxyl group at the δ-position using allyltrimethylsilane mediated by BF3·OEt2, leading to 2,4-diallyl-2-methyl-6-aryltetrahydro-2H-pyran ring systems with quaternary carbon stereogenic centers. This represents the first example of a tandem
本手稿描述了δ羟基-α,使用由BF介导的烯丙基三甲基
硅烷在δ位上具有苄基的羟基的β不饱和酮的烯丙基化了方便,温和,高立体选择性方法3 ·OET 2,导致2具有季碳立体生成中心的,4-
二烯丙基-2-甲基-6-芳基四氢-2 H-
吡喃环系统。这代表了串联异构化的第一个例子,随后在一个罐中发生一个C–O和两个C–C键形成反应。从反应中分离出TMS保护的
乳糖醇作为中间产物,有力地支持了所提出的机制途径。