Expedient Synthesis of N-Substituted 2-Aminothiazoles
摘要:
The reaction of alpha-halo ketones 1 with potassium thiocyanate and amines 3 offers the advantage of an efficient one-pot synthesis of the title compounds 4 from readily available starting materials.
Bromineless Bromine as an Efficient Desulfurizing Agent for the Preparation of Cyanamides and 2-Aminothiazoles from Dithiocarbamate Salts
作者:Ramesh Yella、Veerababurao Kavala、Bhisma K. Patel
DOI:10.1080/00397911003642658
日期:2011.2.28
desulfurizing agent in the preparation of organic cyanamides and substituted thiazoles starting from dithiocarbamicacidsalts. In this approach, alkyl/aryl isothiocyantes were first obtained by the desulfurization of dithiocarbamicacidsalts with EDPBT. The in situ–generated isothiocyanates reacts with an aqueous ammonia, forming alkyl or aryl thioureas, which on subsequent oxidative desulfurization
Reactions between α-haloketones and o-carbethoxy phenyl thiourea have been discussed; a mechanism for the observed exclusive formation of 9:10-thiopega-2:10-diene-4-ones in the case of α-haloalkaryl ketones has been advanced and a number of intermediates isolated in case of chloro acetone.