Versatile Synthesis of N,S-Heterocycles Containing the Antipyrine Moiety
作者:E. Abdel-Latif
DOI:10.1080/104265090969054
日期:2006.1.1
A series of novel sulfide derivatives of expected biological activity were synthesized via the reaction of 4-(chloroacetyl)antipyrine (1) with several sulfur nucleophiles. The quantitatively available 2-aminothiazole derivatives 10 and 11 were coupled with pyrazolopyridinyl and aromatic diazonium salts to furnish a new series of the corresponding pyrazolopyridinylazo and arylazo-thiazole dyes 12 and
Quantitative Gas-Solid Diazotization of 3-Aminopyrazolo[3,4-b]pyridine Derivatives and Azo Dye Syntheses by Means of Solid-Solid Reactions
作者:Gerd Kaupp、Mohamed Abbas Metwally、Fathy A. Amer、Ehab Abdel-latif
DOI:10.1002/ejoc.200390213
日期:2003.4
quantitative syntheses and coupling reactions of the heterocyclic diazonium salts 2. The solid-state diazotization of 1a with gaseous NO2 has been mechanistically investigated by atomic force microscopy (AFM). Azo couplings are achieved in quantitative yields by cautious co-grinding of the solid diazonium salt 2a with five (thio)barbituric acids, six acetoacetanilides (these couplings are followed by internal