Carbon tetrabromide mediated oxidative cyclocondensation of ketones and thioureas: an easy access to 2-aminothiazoles
摘要:
A simple, mild, and efficient one-pot method for the synthesis of substituted 2-aminothiazoles has been reported. The reaction involves the formation of sulfenyl bromide as an umpolung intermediate of nucleophilic sulfur, which is responsible for C-S bond formation leading to oxidative cyclization of ketones and thioureas to furnish the desired products. Carbon tetrabromide was used as a convenient and mild brominating reagent under basic condition at room temperature to give 2-aminothiazoles in good to excellent yields. (C) 2015 Elsevier Ltd. All rights reserved.
An unexpected outcome of a general thiazole synthesis
作者:G. Denis Meakins、Michael D. J. Padgham、Neeta Patel、Josephine M. Peach
DOI:10.1039/c39840000837
日期:——
The reaction between N-benzoyl-N′-methyl-N′-phenylthiourea and chloroacetone gives 5-benzoyl-4-methyl-2-(N-methyl-N-phenylamino)thiazole rather than the 5-acetyl-4-phenylisomer which would be predicted from previous work on this route to thiazoles.