The synthesis of 3-pyrazinyl-imidazo[1,2-a]pyridines from a vinyl ether
摘要:
A new method has been developed for the synthesis of 3-pyrazinyl-imidazo[1,2-a]pyridines. 2-Chloro-6[(Z)-2-ethoxyethenyl]pyrazine was treated with N-bromosuccinimide in dioxane-water to generate the 2-bromo-2-(6-chloropyrazin-2-yl)-1-ethoxyethanol intermediate. In a subsequent one-pot step, optional treatment with various 2-aminopyridines provided the cyclized 3-pyrazinyl-imidazo[1,2-a]pyridines in 31-76% yields. (C) 2010 Elsevier Ltd. All rights reserved.
[EN] 6 SUBSTITUTED 2-HETEROCYCLYLAMINO PYRAZINE COMPOUNDS AS CHK-1 INHIBITORS [FR] COMPOSÉS 2-HÉTÉROCYCLYLAMINO PYRAZINES SUBSTITUÉES EN POSITION 6 EN TANT QU'INHIBITEURS DE CHK-1
The Synthesis of 3-pyrazinyl-pyrazolo [1,5-a] pyridines from an enol ether
作者:Michelle Tran-Dubé、Neal Sach、Sacha Ninkovic、John F. Braganza、Qinhua Huang、Benjamin Johnson、Michael Raymond Collins
DOI:10.1016/j.tetlet.2012.06.035
日期:2012.8
The synthesis of 3-(6-chloropyrazin-2-yl)pyrazolo[1,5-a]pyridine from an enolether and 4-substituted 1-aminopyridinim iodides via a 3+2 cycloaddition is presented. A high throughput reaction screen was used to optimize the yield of the cycloaddition. This protocol is operationally simple, scalable, proceeds at roomtemperature, and the reaction profiles are very clean.
提出了由烯醇醚和4-取代的1-氨基吡啶碘代碘化物通过3 + 2环加成反应合成3-(6-氯吡嗪-2-基)吡唑并[1,5- a ]吡啶。高通量反应筛用于优化环加成的产率。该方案操作简单,可扩展,在室温下进行,反应曲线非常干净。
6 SUBSTITUTED 2- HETEROCYCLYLAMINO PYRAZINE COMPOUNDS AS CHK-1 INHIBITORS
申请人:Braganza John Frederick
公开号:US20110144084A1
公开(公告)日:2011-06-16
The present invention is directed to compounds of formula (I),
and pharmaceutically acceptable salts thereof, their synthesis, and their use as CHK-1 inhibitors.