route to synthesize de novo C3-substituted benzofurans and indoles under mild conditions in moderate to good yields. Mechanistic studies revealed that the rhenium played the role of a π acid catalyst to activate the alkynes, followed by a charge-accelerated [3,3]-sigmatropic rearrangement.
据报道,rh催化的碳烷氧基化和
炔烃的碳
氨基化。该反应提供了在温和条件下以中等至良好产率合成从头C 3取代的
苯并呋喃和
吲哚的有效途径。机理研究表明,played起到π酸催化剂激活
炔烃的作用,然后发生电荷加速的[3,3]-σ重排。