One pot synthesis of 2‐substituted thiobenzoazoles containing α‐sulfenylated aromatic ketones under transition metal‐free conditions

Abstract

An efficient synthesis of 2‐substituted thiobenzoazoles in pot manner was reported. Thus, tetramethylthiuram disulfide (TMTD) reacted with 2‐aminothiophenol, 2‐aminophenol, or 1,2‐phenylenediamine to form 2‐mercaptobenzo heterocycles through cyclization, and the subsequent C‐S bonding with 2‐bromoacetophenones gave the desired 2‐substituted thiobenzoazoles containing α‐sulfenylated aromatic ketones smoothly. The method features transition metal‐free, simple operation, mild conditions, short reaction time, and good yields, showing potential synthetic value for the synthesis of a variety of biological or pharmaceutically active compounds.