6142-13-8Relevant articles and documents
Synthesis and Characterization of 1,3-Bis-(2-dialkylamino-5-thiazolyl)-Substituted Squaraines and Their 2-(Dialkylamino)thiazole Precursors
Keil, D.,Hartmann, H.
, p. 979 - 984 (2007/10/02)
By condensation of squaric acid (1) with 2-(dialkylamino)-substituted thiazoles 8 a novel type of heterocyclic-substituted squaraines of the general structure 9 was prepared in moderate yield mostly.The squaraines 9 obtained are sparingly soluble in the most organic solvents and exhibit, in these solvents, narrow absorption bands in the visible range at about 620-700 nm.In dispersed form, the absorption bands of the squaraines 9 are, however, broadened and shifted into the NIR region at about 900 nm.These unique properties of the new squaraines 9 suggest the use of these dyes as spectral sensitizers for laser-driven data recording or data storage media. - Key Words: Squaraines/ Squaric acid/ Thiazoles/ Sensitizers
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.
Reactions of 1-alkynyl thiocyanates with nucleophilic reagents. Synthesis of 2,4-disubstituted 1,3-thiazoles
Jong, R.L.P. de,Meijer, J.,Sukhai, R.S.,Bradsma, L.
, p. 310 - 313 (2007/10/02)
Reaction of 1-alkynyl thiocyanates RCC-S-CN (1) with alcohols, phenol or thiols or secondary aliphatic amines in the presence of anhydrous zinc chloride or boron trifluoride diethyl etherate gives mixtures of 2,4-disubstituted 1,3-thiazoles (2), thiocarbonyl compounds (3) (thiono esters, dithio esters or thioamides) and 2-alkylidene-1,3-dithioles (4).In all cases, the 1,3-thiazoles can be obtained in good yields if the proper reaction conditions are applied.Interaction between 1 and lithium dialkylamides LiNR'2 gives the compounds RCC-S-NR'2 (5) (attack on sulfur).With alkoxides R'O1-, the primary attack is on CN: the in termediacy alkynethiolate RCC-S1- subsequently reacts with the alkyl cyanate R'OCN to afford 1-alkynyl sulfides RCC-SR'(6)
