CO<sub>2</sub> as a C1 Source: B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>-Catalyzed Cyclization of <i>o</i>-Phenylene-diamines To Construct Benzimidazoles in the Presence of Hydrosilane
作者:Zhenbei Zhang、Qiangsheng Sun、Chungu Xia、Wei Sun
DOI:10.1021/acs.orglett.6b03030
日期:2016.12.16
B(C6F5)3-catalyzed synthesis of benzimidazoles via cyclization of o-phenylenediamines with CO2 and PhSiH3. This metal-free catalytic route achieves the desired products in high yield under convenient reaction conditions and is applicable to a broad substrate scope. A plausible mechanism for the reaction involving a frustrated Lewis pair pathway is proposed based on spectroscopic characterization (e.g., 13C NMR) of
使用CO 2作为碳源催化构建苯并咪唑代表了获得这些有价值的化合物的简便且可持续的方法。在这里,我们描述了B(C 6 F 5)3催化的邻苯二胺与CO 2和PhSiH 3的环化反应,合成苯并咪唑。这种无金属的催化途径可以在方便的反应条件下以高收率获得所需的产物,并适用于广泛的底物范围。基于反应中间体的光谱表征(例如13 C NMR),提出了涉及沮丧的路易斯对途径的反应的合理机制。
Benzimidazole and pyridylimidazole derivatives
申请人:——
公开号:US20030069257A1
公开(公告)日:2003-04-10
This invention relates to benzimidazoles, pyridylimidazoles and related bicyclic heteroaryl compounds, all of which may be described by of Formula I
1
The invention is particularly related to such compounds that bind with high selectivity and high affinity to the benzodiazepine site of GABA
A
receptors. This invention also relates to pharmaceutical compositions comprising such compounds and to the use of such compounds in treatment of certain central nervous system (CNS) diseases. Novel processes for preparing compounds of Formula I are disclosed.
This invention also relates to the use of benzimidazoles, pyridylimidazoles and related bicyclic heteroaryl compounds of Formula I in combination with one or more other CNS agents to potentiate the effects of the other CNS agents. Additionally this invention relates to the use such compounds as probes for the localization of GABA
A
receptors in tissue sections.
Substituted ring-fused imidazole derivatives that bind to GABA
A
receptors are provided. Such compounds may be used to modulate ligand binding to GABA
A
receptors in vivo or in vitro, and are particularly useful in the treatment of a variety of central nervous system (CNS) disorders in humans, domesticated companion animals and livestock animals. Compounds provided herein may be administered alone or in combination with one or more other CNS agents to potentiate the effects of the other CNS agent (s). Pharmaceutical compositions and methods for treating such disorders are provided, as are methods for using such ligands for detecting GABA
A
receptors (e.g., receptor localization studies).
1
The invention is a process for producing haloalkyl pyrimidines as intermediates in the production of benzimidazole and/or pyridylimidazole derivatives having high selectivity and/or high affinity to the benzodiazepine site of GABA
A
receptors.
This invention relates to benzimidazoles, pyridylimidazoles and related bicyclic heteroaryl compounds, all of which may be described by of Formula I
The invention is particularly related to such compounds that bind with high selectivity and high affinity to the benzodiazepine site of GABA
A
receptors. This invention also relates to pharmaceutical compositions comprising such compounds and to the use of such compounds in treatment of certain central nervous system (CNS) diseases. Novel processes for preparing compounds of Formula I are disclosed.
This invention also relates to the use of benzimidazoles, pyridylimidazoles and related bicyclic heteroaryl compounds of Formula I in combination with one or more other CNS agents to potentiate the effects of the other CNS agents. Additionally this invention relates to the use such compounds as probes for the localization of GABA
A
receptors in tissue sections.