Convenient and simple synthesis of 2-aminothiazoles by the reaction of α-halo ketone carbonyls with ammonium thiocyanate in the presence of N-methylimidazole
作者:H.M. Meshram、Pramod B. Thakur、B. Madhu Babu、Vikas M. Bangade
DOI:10.1016/j.tetlet.2012.07.080
日期:2012.9
Substituted 2-aminothiazole derivatives were obtained as a result of N-methylimidazole catalyzed cyclization of α-halo ketone carbonyls with ammoniumthiocyanate in water–alcoholic media. The generality of the method has been demonstrated by screening a series of aromatic/heteroaromatic/aliphatic α-halo ketones, α-halo β-diketones, and α-halo β-ketoesters. The developed method is simple, mild, and
Xanthan Sulfuric Acid: An Efficient Bio-Supported and Recyclable Solid Acid Catalyst for the Synthesis of 2-minothiazole-5-carboxylates and 2-aminoselenazole-5-carboxylates
作者:Bowroju S. Kuarm、Janganati V. Madhav、Bhargavi Rajitha
DOI:10.2174/157017811797249443
日期:2011.10.1
An efficient method has been developed for the synthesis of 2-amino thiazole and selenazole-5-carboxylates from β-ketoesters, thiourea or seleno urea and N-bromo succinamide by using Xanthansulfuricacid as a solidacidcatalyst. The reaction work-up is very simple and the catalyst can be easily separated from the reaction mixture and reused several times in subsequent reactions.