Vinylation of Aryl Ether (Lignin β-O-4 Linkage) and Epoxides with Calcium Carbide through C−O Bond Cleavage
作者:Siew Ping Teong、Jenny Lim、Yugen Zhang
DOI:10.1002/cssc.201701153
日期:2017.8.24
carbide has been increasingly used as a sustainable, easy‐to‐handle, and low‐cost feedstock in organic synthesis. Currently, methodologies of using calcium carbide as “solid acetylene” in synthesis are strictly limited to activation and reaction with X−H (X=C, N, O, S) bonds. Herein, a mild and transition‐metal‐free protocol was developed for the vinylation of epoxides and aryl ether linkage (β‐O‐4 lignin
电石已越来越多地用作有机合成中的可持续,易处理且低成本的原料。目前,在合成过程中使用电石作为“固态乙炔”的方法严格限于活化和与X-H(X = C,N,O,S)键的反应。在此,开发了一种温和且无过渡金属的规程,用于通过C-O键裂解用电石对环氧化物和芳基醚键(β-O-4木质素模型化合物)进行乙烯基化,形成有价值的乙烯基醚产物。碳化钙在C-O键的活化和裂解以及为形成乙烯基化产物提供乙炔源方面起着至关重要的作用。这些令人振奋的结果可能为有机合成提供新方法,并为木质素或生物质相关降解为有用产品提供新见解。