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
摘要 建立了在乙酸钠存在下使用 N-溴代琥珀酰亚胺进行缩氨基脲的超声辅助氧化环化,提供了对各种 2-氨基-1,3,4-恶二唑的高效快速访问。此外,新的合成方案提供了一个简单的程序,利用更安全的氧化系统,以高区域选择性、令人满意的收率和更高的纯度提供目标产品。图形概要