Copper-catalysed oxidative Csp3-H methylenation to terminal olefins using DMF

A copper-catalysed direct oxidative Csp(3)-H methylenation to terminal olefins using DMF as one carbon source was developed. In this reaction, various functional groups were well tolerated, thus providing a simple way to construct arylvinylketones and arylvinylpyridines. The preliminary mechanistic investigations revealed that CH2 was from DMF (N-CH3).