An efficient and straightforward synthetic method for constructing trifluoromethyl 2H-thiophenes through [4 + 1] cycloaddition of enaminothiones with trifluoromethyl N-tosylhydrazones has been disclosed. The cycloaddition platforms were found to be compatible with a broad substrate scope and to show high regio- and stereo-selectivities under very mild reaction conditions such as room temperature, neutral
已公开了一种通过烯胺
硫酮与三
氟甲基N-
甲苯磺酰腙的 [4 + 1] 环加成反应构建三
氟甲基 2 H-
噻吩的有效且直接的合成方法。发现环加成平台与广泛的底物范围兼容,并在非常温和的反应条件下(如室温、中性介质和催化剂负载量低)显示出高区域选择性和立体选择性。