Three‐Component Synthesis of 2‐Substituted Thiobenzoazoles Using Tetramethyl Thiuram Monosulfide (TMTM) as Thiocarbonyl Surrogate

Abstract

A metal‐free synthesis of 2‐benzyl/allyl‐substituted thiobenzoazoles was developed starting from tetramethyl thiuram monosulfide (TMTM) which served as thiocarbonyl surrogate. By using 2‐aminophenols (or 2‐aminothiophenols, or 1,2‐phenylenediamines) and TMTM as starting materials, 2‐mercaptobenzoazoles could be synthesized efficiently. The subsequent C–S bond formation with benzyl/allyl halides gave the final products (2‐benzyl/allyl‐substituted thiobenzoazoles) with good to excellent yields. The metal‐free conditions, inexpensive and easily available starting materials, and broad substrate scope are the advantageous features of this protocol.