A cascade of 5-exo-dig intramolecular nucleophilic addition of enamine to terminal alkyne followed by cross coupling has been demonstrated for the first time. Two new C–C bonds are stereoselectively forged by a single Pd-complex capable of catalyzing two mechanistically diverse transformations. Mechanistic investigations identified cyclization as the rate limiting step relying on the facile displacement
首次证明了烯胺向末端
炔烃进行5- exo-dig分子内亲核加成然后交叉偶联的级联反应。两个新的 C-C 键由单个 Pd 配合物立体选择性地形成,能够催化两种机械上不同的转化。机理研究将环化确定为限速步骤,它依赖于
炔烃对与 Pd 中心弱结合的 OTf 的轻松置换。