A one-pot, three-component aminotriazine annulation onto 5-aminopyrazole-4-carbonitriles under microwave irradiation
摘要:
A one-pot, three-component, microwave-assisted reaction of 5-aminopyrazole-4-carbonitriles, triethyl orthoformate and cyanamide afforded novel 7-arylamino-substituted 4-aminopyrazolo[1,5-a][1,3,51 triazine-8-carbonitriles. The reaction proceeded in a chemo- and regioselective manner resulting in the successful amino-1,3,5-triazine annulation onto 5-aminopyrazole-4-carbonitriles to give 4-aminopyrazolo [1,5-a][1,3,5]triazine-8-carbonitriles. The operational simplicity of the method and high purity of the products, which can be isolated via simple filtration, make this approach attractive for the preparation of a library of compounds for drug discovery processes. (C) 2014 Elsevier Ltd. All rights reserved.
Abstract One-pot synthesis of (5Z,7Z)-5-amino-7-(ethyl or arylimino)-2,3,4,7-tetrahydro-1,4-thiazepine-6-carbonitriles from cyclocondensation of 2-((ethyl or arylamino)(mercapto)methylene)malononitrile potassium salts or their methylated derivatives with 2-chloroethylamine hydrochloride or cysteamine in dimethylformamide via two routes but a single intermediate is described.
摘要 (5Z,7Z)-5-amino-7-(ethyl or arylimino)-2,3,4,7-tetrahydro-1,4-thiazepine-6-carbonitriles 由 2-(((乙基或芳基氨基)(巯基)亚甲基)丙二腈钾盐或其甲基化衍生物与 2-氯乙胺盐酸盐或半胱胺在二甲基甲酰胺中通过两种途径但描述了单一中间体。
Ammar, Y. A.; El-Sharief, A. M. Sh.; Zahran, M. A., Journal of Chemical Research - Part S, 1995, # 8, p. 324 - 325
作者:Ammar, Y. A.、El-Sharief, A. M. Sh.、Zahran, M. A.、El-Said, M. Z.、El-Said, U. H.