Ultrasound-assisted synthesis of 2-amino-1,3,4-oxadiazoles through NBS-mediated oxidative cyclization of semicarbazones
作者:Ana Flávia Borsoi、Mateus Emanuel Coldeira、Kenia Pissinate、Fernanda Souza Macchi、Luiz Augusto Basso、Diógenes Santiago Santos、Pablo Machado
DOI:10.1080/00397911.2017.1324626
日期:2017.7.18
ABSTRACT A ultrasound-assisted oxidative cyclization of semicarbazones using N-bromosuccinimide in the presence of sodium acetate was established providing efficient and rapid access to a variety of 2-amino-1,3,4-oxadiazoles. Moreover, the new synthetic protocol provides a simple procedure utilizing a safer oxidizing system that affords the target products in high regioselectivity, satisfactory yields