Electrochemical Cyclization of Alkynyl Aryl Ketones for the Synthesis of 3‐Seleno/3‐Trifluoromethyl Substituted Thiochromones

A facile electrochemical synthesis of various 3‐seleno/3‐trifluoromethyl‐substituted thiochromones via cyclization of alkynyl aryl ketones is described. This synthetic approach offers numerous attractive advantages, including operational simplicity, mild reaction conditions, and the avoidance of both external catalysts and chemical oxidants. Furthermore, the scale‐up reaction indicates the practicability of this electrosynthesis strategy. On the basis of a series of mechanism verification experiments, a reasonable mechanism of the reaction has been proposed.