Lei Song, Fu-Qiang Li, Xiao-Han Qiu, Guo-Zhen Wei, Hui-Yu Chen, Ming Bian, Yu-Ning Gao, Zhen-Jiang Liu
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Copper-catalyzed tandem cyclization reaction of ethynylbenzoxazinones and thiols: facile construction of 2-thiomethylene indoles.
The first successful copper-catalyzed decarboxylative cyclization reaction of ethynylbenzoxazinones and thiols has been developed. A rarely studied α-addition process to a copper-allenylidene intermediate promoted this reaction. Using this protocol, a range of 2-thiomethylene indole compounds have been obtained. This methodology offers significant advantages including mild reaction conditions, cheap catalysts, good yields and broad substrate compatibility.