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
Synthesen auf der Basis von 2-Oxoglutars�ure. IV. Regioselektive Synthese substituierter 2-(2-Methoxycarbonyl-2H-thiopyran-3-yl)glyoxyls�uremethylester