Continued development of the Sonogashira coupling has made it a well established and versatile reaction for the straightforward formation of C–C bonds, forging the carbon skeletons of broadly useful functionalized molecules. However, asymmetric Sonogashira coupling, particularly for C(sp³)–C(sp) bond formation, has remained largely unexplored. Here we demonstrate a general stereoconvergent Sonogashira C(sp³)–C(sp) cross-coupling of a broad range of terminal alkynes and racemic alkyl halides (>120 examples) that are enabled by copper-catalysed radical-involved alkynylation using a chiral cinchona alkaloid-based P,N-ligand. Industrially relevant acetylene and propyne are successfully incorporated, laying the foundation for scalable and economic synthetic applications. The potential utility of this method is demonstrated in the facile synthesis of stereoenriched bioactive or functional molecule derivatives, medicinal compounds and natural products that feature a range of chiral C(sp³)–C(sp/sp²/sp³) bonds. This work emphasizes the importance of radical species for developing enantioconvergent transformations.

Sonogashira偶联的不断发展使它成为直接建立C–C键的公认且通用的反应，从而锻造了广泛有用的功能化分子的碳骨架。但是，特别是对于C（sp ³）–C（sp）键形成的非对称Sonogashira偶联，在很大程度上仍未得到开发。在这里，我们展示了一个一般的立体会聚Sonogashira C（sp ³）–C（sp）使用手性金鸡纳生物碱基的P，N-配体，通过铜催化的自由基参与的炔基化作用实现了广泛的末端炔烃和外消旋烷基卤化物（> 120实例）的交叉偶联。与工业相关的乙炔和丙炔已成功整合，为可扩展且经济的合成应用奠定了基础。该方法的潜在用途在具有丰富手性C（sp ³）–C（sp / sp ² / sp ³）特征的立体富集的生物活性或功能分子衍生物，药物化合物和天然产物的简便合成中得到了证明。）债券。这项工作强调了自由基物种对发展对映会聚转化的重要性。