Flow and batch mode focused microwave synthesis of 5-amino-4-cyanopyrazoles and their further conversion to 4-aminopyrazolopyrimidines
作者:Catherine J. Smith、Francisco Javier Iglesias-Sigüenza、Ian R. Baxendale、Steven V. Ley
DOI:10.1039/b709043a
日期:——
A new approach to the synthesis of 5-amino-4-cyanopyrazoles has been developed, utilising a novel flow microwave device. These products are then converted by a batch mode microwave process to structurally more complex dimeric and ‘mixed’ pyrazolopyrimidine structures.
作者:Liesa Röder、Alexander J. Nicholls、Ian R. Baxendale
DOI:10.3390/molecules24101996
日期:——
Continuous flow processing was applied for the rapid replacement of an aromatic amino group with a hydride. The approach was applied to a range of aromaticheterocycles, confirming the wide scope and substituent-tolerance of the processes. Flow equipment was utilized and the process optimised to overcome the problematically-unstable intermediates that have restricted yields in previous studies relying
Heterocyclic Synthesis with Nitriles: Synthesis of Pyrazolopyrimidine and Pyrazolopyridine Derivatives
作者:Abdellatif M. Salaheldin、Ana M. F. Oliveira-Campos、Lígia M. Rodrigues
DOI:10.1080/00397910802517814
日期:2009.3.10
Abstract The reaction of N 1-substituted-5-amino-4-cyanopyrazoles with malononitrile and diethylmalonate occurs with formation of 6-substituted pyrazolo[3,4-d]pyrimidines, and pyrazolo[3,4-b]pyridines respectively. The structures of the products and conceivable mechanisms are discussed.
摘要 N 1-取代-5-氨基-4-氰基吡唑与丙二腈和丙二酸二乙酯反应分别生成6-取代吡唑并[3,4-d]嘧啶和吡唑并[3,4-b]吡啶。讨论了产品的结构和可能的机制。