Synthesis of 2-amino-substituted-1,3,4-thiadiazoles via 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) mediated intramolecular C–S bond formation in thiosemicarbazones
作者:Sarangthem Joychandra Singh、Suresh Rajamanickam、Anupal Gogoi、Bhisma K. Patel
DOI:10.1016/j.tetlet.2016.01.083
日期:2016.3
An effective oxidative intramolecular cyclization (C–S bond formation) of thiosemicarbazones using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) has been developed to afford a diverse array of 2-amino-substituted-1,3,4-thiadiazoles. The attractive features of this protocol are operational simplicity, obviates the need of expensive transition-metal catalysts and broad substrate scope.
已开发出使用2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)的硫半脲的有效氧化分子内环化(CS键形成),以提供各种2-氨基取代的- 1,3,4-噻二唑。该协议的吸引人的特点是操作简单,无需昂贵的过渡金属催化剂和广泛的底物范围。