Pd<sup>II</sup>
-Catalyzed Regio- and Enantioselective Oxidative C−H/C−H Cross-Coupling Reaction between Ferrocenes and Azoles
作者:Zhong-Jian Cai、Chen-Xu Liu、Qing Gu、Chao Zheng、Shu-Li You
DOI:10.1002/anie.201813887
日期:2019.2.11
Asymmetric C−H bond functionalization reaction is one of the most efficient and straightforward methods for the synthesis of optically active molecules. Herein we disclose an asymmetric C−H/C−H cross‐coupling reaction of ferrocenes with azoles such as oxazoles and thiazoles. Palladium(II)/monoprotected amino acid (MPAA) catalytic system which exhibits excellent reactivity and regioselectivity for oxazoles
不对称CH键功能化反应是旋光分子合成中最有效,最直接的方法之一。在这里,我们公开了二茂铁与诸如恶唑和噻唑的唑的不对称CH / CH交叉偶联反应。钯(II)/单保护氨基酸(MPAA)催化体系,对恶唑和噻唑表现出出色的反应性和区域选择性。该方法为构建平面手性二茂铁提供了强有力的策略。机理研究表明,唑类化合物的CH键断裂很可能是通过S E Ar过程进行的,并且可能不是营业额限制步骤。
[EN] BENZIMIDAZOLE INHIBITORS OF LEUKOTRIENE PRODUCTION<br/>[FR] INHIBITEURS BENZIMIDAZOLE DE LA PRODUCTION DE LEUCOTRIÈNES
申请人:BOEHRINGER INGELHEIM INT
公开号:WO2011068821A1
公开(公告)日:2011-06-09
The present invention relates to compounds of formula (I) and pharmaceutically acceptable salt thereof, wherein R1-R7 are as defined herein. The invention also relates to pharmaceutical compositions comprising these compounds, methods of using these compounds in the treatment of various diseases and disorders, processes for preparing these compounds and intermediates useful in these processes.
Palladium-catalyzed oxidative cross-coupling of azole-4-carboxylates with indoles: an approach to the synthesis of pimprinine
作者:Haipin Zhou、Kuo Gai、Aijun Lin、Jinyi Xu、Xiaoming Wu、Hequan Yao
DOI:10.1039/c4ob01844c
日期:——
An efficient and straightforward method for the production of 5-(3-indolyl)azoles incorporating the privileged structures indoles and azoles via palladium-catalyzed double C-H bond cleavage under mild conditions was disclosed. As expected, this protocol provided an easy method for the synthesis of indolealkaloids pimprinine and WS-30581 A in moderate yields.
A Cationic Iridium-catalyzed C(sp<sup>3</sup>)–H Silylation of 2-Alkyl-1,3-azoles at the α-Position in the 2-Alkyl Group Leading to 2-(1-Silylalkyl)-1,3-azoles
The regioselective silylation of the α-C(sp3)–H bond in the 2-alkyl group in 2-alkyl-1,3-azole derivatives with hydrosilanes, catalyzed by the combination of (POCOPtBu)IrHCl and NaBArF4, leading to the production of 2-(1-silylalkyl)-1,3-azoles is described. The presence of 3,5-dimethylpyridine is required for the reaction to procced. Although the reaction takes place both in the presence and absence of a hydrogen acceptor, the addition of an acceptor gave better results, in terms of the efficiency of the reaction.
The synthesis of oxazoles by thermolysis or photolysis of 2-acylisoxazol-5-ones
作者:Kiah H. Ang、Rolf H. Prager、Jason A. Smith、Ben Weber、Craig M. Williams
DOI:10.1016/0040-4039(95)02240-6
日期:1996.1
N-acylisoxazol-5-ones are converted into the corresponding 2-substituted oxazoles by photolysis at 300 or 254nm, or by flash vacuum pyrolysis. The former procedure is favoured for isoxazolones with electron withdrawing groups at C-4, and pyrolysis for all others.