Regioselective Synthesis of 2- and 3-Substituted Imidazo[1,2-<i>a</i>]pyridines
作者:Guoping Liu、Xuefeng Cong、Jiaheng He、Shunzhong Luo、Di Wu、Jingbo Lan
DOI:10.3184/174751912x13499663832261
日期:2012.12
A range of 2- or 3-substituted imidazo[1,2- a]pyridines were prepared from 2-aminopyridine derivatives and gem-dibromovinyl compounds by the tandem nucleophilic substitution (or nucleophilic addition)/cyclisation reaction.
N-Heterocyclic carbene–palladium(<scp>ii</scp>)–1-methylimidazole complex catalyzed direct C–H bond arylation of imidazo[1,2-a]pyridines with aryl chlorides
We herein reported the N-heterocyclic carbene–palladium(II)–1-methylimidazole complex catalyzed direct C–H bond arylation of imidazo[1,2-a]pyridines with aryl chlorides. Under suitable conditions, all reactions between various imidazo[1,2-a]pyridines and aryl chlorides worked well to give the desired C3–H arylated products in acceptable to high yields, giving a convenient and alternative method for
我们在本文中报道了N-杂环卡宾-钯(II)-1-甲基咪唑配合物催化的咪唑并[1,2- a ]吡啶与芳基氯化物直接进行CH键芳构化。在合适的条件下,各种咪唑并[1,2- a ]吡啶与芳基氯化物之间的所有反应均能很好地产生所需的C3-H芳基化产物,并且收率高,从而为直接的C-H键提供了一种方便且可替代的方法使用经济且容易获得的芳基氯化物作为芳基化试剂,使咪唑并[1,2- a ]吡啶进行芳基化。
Pd-catalyzed oxidative C–H/C–H cross-coupling of pyridines with heteroarenes
作者:Bo Liu、Yumin Huang、Jingbo Lan、Feijie Song、Jingsong You
DOI:10.1039/c3sc50348h
日期:——
We have developed for the first time a general, concise and highly selective method for the C2-heteroarylation of pyridines and related azines with a broad range of heteroarenes via a two-fold C–H activation, which streamlines the previous approaches that require the activated azine N-oxide as the coupling partner.
n-Bu<sub>4</sub>NI-catalyzed selective dual amination of sp<sup>3</sup> C–H bonds: oxidative domino synthesis of imidazo[1,5-c]quinazolines on a gram-scale
作者:Dan Zhao、Teng Wang、Qi Shen、Jian-Xin Li
DOI:10.1039/c4cc01444h
日期:——
An n-Bu4NI catalyzed domino reaction that involves selective dual amination of sp(3) C-Hbonds has been developed. The protocol affords a facile and efficient approach to the synthesis of imidazo[1,5-c]quinazolines under mild conditions.