New regio-selective method of combinatorial synthesis of substituted thiophenes, thieno[3,2-b]pyridines and other heterocycles via combination of ‘domino’-type reactions
作者:Andrey A. Zubarev、Anatoliy M. Shestopalov、Natalia A. Larionova、Lyudmila A. Rodinovskaya、Alexander A. Shestopalov
DOI:10.1016/j.tet.2013.09.025
日期:2013.11
We present a novel combinatorial multicomponent regio-selective approach towards the synthesis of thieno[3,2-b]pyridines and pyridine pyrans. The methodology is based on the ‘domino’-type reaction. The high regio-selectivity in this reaction is gained by the in situ generation of the mono-potassium salt of 2-cyano-1-mercaptoethenethiolate. We also demonstrate that the use of ethyl 2-cyanoacetate in
A facile synthesis of some thieno/furo-[2,3-<i>d</i>]pyrimidine-2-yl-thioacetic acid derivatives
作者:S̨Eref Demirayak、Usama Abu Mohsen
DOI:10.1002/jhet.5570380234
日期:2001.3
The reaction of 2-(α-chloroacetamido)-3-cyano-4,5-disubstituted thiophenes/furanes with ammonium thiocyanate in methanol or ethanol afforded methyl or ethyl (4-amino-5,6-disubstituted thieno/furo[2,3-d]-pyrimidine-2-yl)thioacetates in good yields.
Neue Synthese von substituierten 4-Amino-chinazolinen und deren Heteroanalogen
作者:K. Gewald、H. Sch�fer、K. Eckert、T. Jeschke
DOI:10.1002/prac.19963380144
日期:——
N-Chloracetyl-anthranilonitriles react with potassium thiocyanate in the presence of alcohol to the (4-amino-quinazolin-2-yl-thio)-acetic acid ester (5). In the presence of water or primary amine the acetic acid derivative (6) or the acetic acid amide derivatives (7) are obtained. 2,4-Diamino-quinazolines (8) arise if vigorous reaction conditions are employed. With 2-chloracetylamino-cyclopent-1-en-carbonitrile as starting material the pyrimidines (11) are formed from the reaction with potassium thiocyanate. Analogously, (4-pyrimidyl-2-yl-seleno)-acetic acid ester (12) and (thiazolo[4,5d]pyrimid-2-yl-seleno)-acetic acid derivatives (16)can be prepared with potassium selenocyanate. N-Chloracetyl derivatives of 5-membered heterocycles with enamino-nitrile structure (13, 15, 18, 20) react with potassium thiocyanate to yield thieno[2,3-d]-, thiazolo[4,5-d]-, pyrrolo[2,3-d]-, furo[2,3-d]and pyrazolo[4,3-d]pyrimidines (14, 16, 19a, 19b, 21).
Synthese und Reaktionen von 2-Amino-1-aryl-5-oxo-?2-pyrrolin-3-carbonitrilen
作者:Harry Sch�fer、Karl Gewald
DOI:10.1007/bf00811744
日期:1989.4
SCHAFER, HARRY;GEWALD, KARL, MONATSH. CHEM., 120,(1989) N, C. 315-322