在本文中,我们报告了在三卤代脱氮嘌呤的Suzuki交叉偶联反应中有机三氟硼酸钾盐作为亲核有机硼试剂的用途。通过使用该方案以良好至优异的产率合成了区域异构的C-2-取代的咪唑并[4,5- b ]吡啶类似物。芳基和杂芳基三氟硼酸酯容易反应,以高收率得到偶联产物,而三氟硼酸烷基酯则反应性较低。发现乙酸四丁铵的利用在提高交叉偶联过程的反应速率中起重要作用。另外,在硼酸和有机三氟硼酸钾盐之间进行了比较研究。
在本文中,我们报告了在三卤代脱氮嘌呤的Suzuki交叉偶联反应中有机三氟硼酸钾盐作为亲核有机硼试剂的用途。通过使用该方案以良好至优异的产率合成了区域异构的C-2-取代的咪唑并[4,5- b ]吡啶类似物。芳基和杂芳基三氟硼酸酯容易反应,以高收率得到偶联产物,而三氟硼酸烷基酯则反应性较低。发现乙酸四丁铵的利用在提高交叉偶联过程的反应速率中起重要作用。另外,在硼酸和有机三氟硼酸钾盐之间进行了比较研究。
The present invention is directed to compounds of formula I:
or a pharmaceutically acceptable salt thereof, wherein the substituents are as defined herein.
本发明涉及以下化合物的公式I:或其药用可接受的盐,其中取代基如本文所定义。
Azabenzimidazole compounds
申请人:Pfizer Inc.
公开号:US09120788B2
公开(公告)日:2015-09-01
The present invention is directed to compounds of formula I:
or a pharmaceutically acceptable salt thereof, wherein the substituents are as defined herein.
本发明涉及式I的化合物:或其药学上可接受的盐,其中取代基如此定义。
Microwave enhanced Suzuki coupling: a diversity-oriented approach to the synthesis of highly functionalised 3-substituted-2-aryl/heteroaryl imidazo[4,5-b]pyridines
作者:Ayyiliath M. Sajith、A. Muralidharan
DOI:10.1016/j.tetlet.2011.12.051
日期:2012.2
A modified approach for the synthesis of 3-substituted 2-aryl/heteroaryl imidazo[4,5-b]pyridines utilising palladium catalysed cross-coupling reactions under microwave enhanced conditions has been achieved. utilisation of (A-(ta)phos)(2)PdCl2-catalysed cross-coupling reactions enables rapid derivatization of this (imidazo[4,5-b]pyridines) pharmaceutically relevant core. This catalytic system is compatible with a broad spectrum of arylboronic acids electron rich, electron poor, and heteroarylboronic acids. (C) 2011 Elsevier Ltd. All rights reserved.
AZABENZIMIDAZOLE COMPOUNDS AS INHIBITORS OF PDE4 ISOZYMES FOR THE TREATMENT OF CNS AND OTHER DISORDERS