Efficient palladium(II)-catalyzed homocoupling of thiazole-4-carboxylic or oxazole-4-carboxylic derivatives
摘要:
An efficient Pd(OAc)(2)-catalyzed homocoupling of thiazole-4-carboxylic or oxazole-4-carboxylic derivatives is described. It represents a facile and practical methodology to prepare bis-5,5'-thiazole (oxazole)-4,4'-dicarboxylic derivatives in good to excellent yields. This protocol tolerates a series of substitutions on the thiazole (oxazole) rings, including alkyl, carbonyl, and electron-withdrawing/donating group substituted phenyl groups. (C) 2011 Elsevier Ltd. All rights reserved.
Cobalt-Catalyzed Cross-Dehydrogenative C(sp<sup>2</sup>
)−C(sp<sup>3</sup>
) Coupling of Oxazole/Thiazole with Ether or Cycloalkane
作者:Xiaojiao Wang、Bowen Lei、Lifang Ma、Lisi Zhu、Xinyue Zhang、Hao Zuo、Dailin Zhuang、Ziyuan Li
DOI:10.1002/asia.201701258
日期:2017.11.2
Direct C5‐alkylation of oxazole/thiazole with ether or cycloalkane has been achieved through a cobalt‐catalyzed cross‐dehydrogenative coupling (CDC) process in moderate to good yields. This transformation represents the first C(sp2)−C(sp3) cross‐coupling at the C5‐position of the oxazole/thiazole via double C−H bond cleavages. Various functional groups on oxazole/thiazole substrates, as well as water
Purple acid phosphatase inhibitors as leads for osteoporosis chemotherapeutics
作者:Waleed M. Hussein、Daniel Feder、Gerhard Schenk、Luke W. Guddat、Ross P. McGeary
DOI:10.1016/j.ejmech.2018.08.004
日期:2018.9
obtaining the human enzyme, the corresponding enzymes from red kidney bean and pig have been used previously to develop specific PAP inhibitors. Here, existing lead compounds were further elaborated to create a series of inhibitors with Ki values as low as ∼30 μM. The inhibition constants of these compounds were of comparable magnitude for pig and red kidney bean PAPs, indicating that relevant binding interactions
Iron-catalyzed C(5)−H Imidation of Azole with <i>N</i>
-Fluorobenzenesulfonimide
作者:Xiaojiao Wang、Bowen Lei、Lifang Ma、Huixuan Jiao、Wenhua Xing、Jiaming Chen、Ziyuan Li
DOI:10.1002/adsc.201701124
日期:2017.12.19
An iron(II)‐catalyzed direct imidation of oxazole and thiazole with N‐fluorobenzenesulfonimide (NFSI) through C(5)−H bond cleavage is disclosed, providing C5‐imidated azoles in moderate to excellent yields with broad substrate scope. This reaction represents the first iron‐catalyzed C−Himidation of arene where NFSI serves as the imidation reagent, and potentially constitutes an efficient access to
Palladium(II)-catalyzed oxidative Heck coupling of thiazole-4-carboxylates
作者:Ziyuan Li、Ling Ma、Changhua Tang、Jinyi Xu、Xiaoming Wu、Hequan Yao
DOI:10.1016/j.tetlet.2011.08.088
日期:2011.10
Oxidative Heck coupling of thiazole-4-carboxylates via palladium(II)-catalyzed C-H bond activation has been achieved in moderate to good yields. No ligand, and no acidic additive were used in the reaction. The results showed that this protocol tolerated a series of substitutions on the thiazole ring. A preliminary attempt of direct arylation with p-xylene via Pd(II)-catalyzed C-H bond activation has also been done. (C) 2011 Elsevier Ltd. All rights reserved.
Aryl–aryl coupling via palladium-catalyzed C–P/C–H bond cleavage
作者:Ziyuan Li、Haipin Zhou、Jinyi Xu、Xiaoming Wu、Hequan Yao
DOI:10.1016/j.tet.2013.02.001
日期:2013.4
The first example of aryl-aryl coupling through palladium-catalyzed C-P/C-H bond cleavage with good functional group tolerance is disclosed. This work demonstrates the phosphines could be used as coupling partners in palladium-catalyzed aryl-aryl coupling. (C) 2013 Elsevier Ltd. All rights reserved.