Microwave assisted one pot synthesis of 2-ethylamino benzimidazole, benzoxazole and benzothiazole derivatives
作者:Thirupathi Rapolu、Pavan Kumar K. V. P.、Korupolu Raghu Babu、Satheesh Kumar Dende、Rajashekar Reddy Nimmareddy、Leleti Krishnakanth Reddy
DOI:10.1080/00397911.2019.1599952
日期:2019.5.19
rapid and efficient one-pot method for the synthesis of 2-ethylamino benzimidazole, benzoxazole, and benzothiazole derivatives has been described. The reaction of o-phenylenediamines or o-aminophenols or 2-mercaptoanilines with EDC.HCl under microwave irradiation afforded the corresponding 2-ethylamino benzimidazole, benzoxazole and benzothiazole derivatives in excellent yields. Graphical Abstract
Fe/S-Catalyzed Redox Condensation of <i>o</i>-Nitrophenols with Isothiocyanates to 2-Aminobenzoxazoles
作者:Le Anh Nguyen、Supasorn Phaenok、Duc Long Le、Thi Thu Tram Nguyen、Quoc Anh Ngo、Thanh Binh Nguyen
DOI:10.1021/acs.orglett.3c01897
日期:2023.7.14
and related sulfur containingcompounds should be treated in a safe way to lower their adverse health and environmental effects, especially in large scale syntheses. As a proof of concept, we report herein an example of in situ recycling of sulfur byproduct to reductant in the synthesis of bioactive 2-aminobenzoxazoles 3. Using an Fe/S catalytic system, this heterocyclic scaffold could be obtained from