通过N H / O H / S H官能化作用的对甲苯磺酸催化的无金属甲醛[4 +1]杂环化反应:一锅即可获得2-芳基/杂芳基/烷基苯并唑衍生物
摘要:
通过2-氨基(硫代)的级联偶联反应,已公开了一种高产率(80-98%)的简洁,直接的一锅[4 +1]合成策略,用于构建2-取代的苯并唑,如苯并恶唑和苯并噻唑酚与β-氧二硫代酯。目前的方法可以在无溶剂条件下在一锅中实现N H / O H / S H官能化,从而无需使用任何外部金属即可产生多种苯并恶唑。各种各样的2-氨基(硫代)酚和β-氧二硫代酯均具有出色的官能团耐受性,可用于该转化。此外,我们通过证明其与DNA拓扑异构酶II抑制剂的多样化多样化的相容性,抢占了这一新策略的广泛含义。
Stable Pd(0) Complexes with Ferrocene Bisphosphanes Bearing Phosphatrioxaadamantyl Substituents Efficiently Catalyze Selective C‐H Arylation of Benzoxazoles by Aryl Chlorides
作者:Filip Horký、Ivana Císařová、Petr Štěpnička
DOI:10.1002/cctc.202101013
日期:2021.11.22
Heterocycle arylation: New donor-asymmetric ferrocene bis-phosphanes structurally related to the ubiquitous 1,1’-bis(diphenylphosphanyl)ferrocene (dppf) equipped with bulky and electron-poor phosphatrioxaadamantylsubstituents have been synthesized and converted into stablePd(0) complexes. The complexes were applied as potent catalysts for Pd-mediated C−H bond arylation of benzoxazoles with aryl chlorides
An Iron and Copper System Catalyzed C–H Arylation of Azoles with Arylboronic Acids
作者:Song-Lin Zhang、Wei-Ye Hu、Pei-Pei Wang
DOI:10.1055/s-0034-1379073
日期:——
An efficient, environmentally friendly, and economical new method for arylation reactions of azoles with arylboronic acids via copper-iron-catalyzed C-H and C-B bond activation has been developed. The protocol tolerates a series of functional groups, such as methoxy, nitro, cyano, chloro, and trifluoromethyl groups.