82721-93-5Relevant articles and documents
A NEW GENERAL SYNTHESIS OF 2-(N-MONO- AND N-DI-SUBSTITUTED AMINO)THIAZOLES
Brown, Michael D.,Gillon, David W.,Meakins, G. Denis,Whitham, Gordon H.
, p. 1623 - 1626 (2007/10/02)
Although α-mercapto ketones react with cyanamides to give substituted 2-aminothiazoles the yields are satisfactory in only the simplest cases.However, a range of 2-aminothiazoles with substituents on the ring or the exo-nitrogen atom was obtained efficiently by the following one-pot procedure: a solution of an α-mercapto ketone anion was generated by treating an O-ethyl S-2-oxoethyl dithiocarbonate with piperidine at 20 deg C, a cyanamide was added, and the solution was heated for 3-6 h.
N,N-Disubstituted 2-Aminothiazole-5-carbaldehydes: Preparation and Investigation of Structural Features
Gillon, David W.,Forrest, Ian J.,Meakins, G. Denis,Tirel, Malcolm D.,Wallis, John D.
, p. 341 - 348 (2007/10/02)
Methods of preparing N,N-disubstituted 2-aminothiazoles have been investigated. 4-Substituted N,N-dimethyl-, N-benzyl-N-methyl-, and N-methyl-N-phenyl-amines were prepared and converted by Vilsmeier formylation into 2-amino-5-carbaldehydes which were examined by i.r. and 1H n.m.r. spectrometry.The aldehyde group adopts the carbonyl O,S-syn-conformation.With the N,N-dimethyl and N-benzyl-N-methyl compounds the barrier to rotation of the amine group (ΔG(excit.)) is 50-55 kJ mol-1 and is insensitive to the nature of the 4-substituent.The amine group of the N-methyl-N-phenyl compounds has a marked preference for one orientation.This was shown by a crystallographic study of 4-t-butyl-2-(N-methyl-N-phenylamino)thiazole-5-carbaldehyde to have the phenyl group directed towards the sulphur atom of the thiazole ring.