A new general and efficient synthesis of imidazo[4,5-c]pyrazoles (5) is reported. The key step of this synthetic procedure is the intramolecular cyclodehydration of 5-alkylamino-4-nitrosopyrazoles (4), which affords the title compounds (5) in good yields.
A new synthesis of imidazo [4,5-c] pyrazoles, obtained through cyclisation of 4-nitroso-5-alkylamino-pyrazoles, is described.
描述了通过4-亚硝基-5-烷基氨基-吡唑环化获得的咪唑并[4,5-c]吡唑的新合成方法。
FUSED HETEROCYCLIC DERIVATIVE AND USE THEREOF
申请人:Sakai Nozomu
公开号:US20090137595A1
公开(公告)日:2009-05-28
The present invention provides a fused heterocyclic derivative having a potent kinase inhibitory activity and use thereof.
A compound represented by the formula (I):
wherein each symbol is as defined in the specification, except a particular compound, or a salt thereof, and a pharmaceutical agent containing the compound or a prodrug thereof, which is a kinase (VEGFR, VEGFR2, PDGFR, Raf) inhibitor, an angiogenesis inhibitor, an agent for the prophylaxis or treatment of cancer, a cancer growth inhibitor or a cancer metastasis suppressor.
Silver(II) oxide-mediated synthesis of 2,4-diarylquinazolines
作者:Wing Cheung、Raymond J. Patch、Mark R. Player
DOI:10.1016/j.tetlet.2018.05.019
日期:2018.6
4-diarylquinazolines is described which involves a silver oxide-mediated CH activation/CN bond formation process. The generality of this method with respect to substituent effects is presented along with studies leading to process optimization. Mechanistic investigations provide support for the involvement of radical intermediates in the reaction process.
描述了合成2,4-二芳基喹唑啉的单釜法,该法涉及氧化银介导的C H活化/ C N键形成过程。提出了有关取代基效应的通用方法以及导致工艺优化的研究。机理研究为自由基中间体参与反应过程提供了支持。
Synthesis of Heterocycles<i>via</i>Nitrilium Salts; XVI. Pyrazolo[3,4-<i>d</i>]pyrimidines
作者:Ramón Madroñero、Salvador Vega
DOI:10.1055/s-1987-28026
日期:——
Based on the electrophilic properties of nitrilium salts formed by interaction of 5-aroylaminopyrazoles, nitriles, and Lewis acids, a new general method for the synthesis of pyrazolo[3,4-d]pyrimidines has been developed.