Copper-Catalyzed <i>N</i>-Arylation of Azoles and Mannich-Type Coupling of Ketones and Azoles under Metal-Free Conditions
作者:Kai Sun、Zhonghong Zhu、Jingjing Sun、Lulu Liu、Xin Wang
DOI:10.1021/acs.joc.5b02593
日期:2016.2.19
five-membered heterocycles with azoles. Five-membered heterocycles bearing an acetyl group also underwent a Mannich-type reaction with activated azoles to give the corresponding β-amino ketonesundermetal-freeconditions. These reactions exhibited wide substrate scope, high functional group tolerance, and ease of operation, making them useful tools with numerous potential applications in synthetic chemistry
Unveiling N-Fused Nitreniums as Potent Catalytic Photooxidants
作者:Samim Sohel Rana、Joyanta Choudhury
DOI:10.1021/jacs.3c12606
日期:2024.2.14
hitherto-unknown facet of catalyticphotooxidant capability of nitrenium cations is reported herein. The fundamental limitation of inability of the traditional and reported nitreniums to achieve the excited-state redox potential beyond +2.0 V (vs Ag/AgCl), the primary requirement for a powerful photooxidant, is addressed in this work by developing a structurally unique class of N-fusednitrenium cations, with
本文报道了氮阳离子催化光氧化能力的迄今为止未知方面的第一个例子。传统和已报道的氮化合物无法实现超过 +2.0 V 的激发态氧化还原电位(相对于 Ag/AgCl),这是强效光氧化剂的主要要求,这一根本限制在本工作中通过开发一类结构独特的氮化合物来解决。 N-稠合氮阳离子,所需的结构工程涉及通过氮位点上的环稠合进行广泛的π-共轭,这使得LUMO能量显着降低并且在激发态下易于还原(激发态氧化还原电位高达+2.5 V与 Ag/AgCl 相比),通过产生的自由基的有效离域/稳定来促进。这一发现为发现氮阳离子除路易斯酸度之外的新颖且有用的(光)催化特性开辟了一条新途径。
Copper-Catalyzed Cross-Dehydrogenative C–N Bond Formation of Azines with Azoles: Overcoming the Limitation of Oxidizing N–O Activation Strategy
Here, we report the copper-catalyzed C2 selective cross-dehydrogenative C-N bond formation of azines with azoles. This straightforward method enables us to address the key limitation of prior N-O activation strategy in C2 amination of azines. The wide substrate scope, high functional group tolerance, and ease of operation of the present method are expected to promote its potential application in synthetic chemistry.
Pd- and Cu-catalyzed selective arylation of benzotriazole
作者:Irina P. Beletskaya、Dmitri V. Davydov、Marcial Moreno-Mañas
DOI:10.1016/s0040-4039(98)01062-4
日期:1998.7
Palladium(O)-catalyzed arylation of 1H-1,2,3-benzotriazole (BTA) in DMF at 150 degrees C in the presence of copper salt with arylhalides proceeds regioselectively at N-1 position. Best result has been obtained with the PdCl2(dppe) as catalyst and the Cu(II) phenylcyclopropylcarboxylate as co-catalyst. (C) 1998 Elsevier Science Ltd. All rights reserved.