Sequentially Pd/Cu‐Catalyzed Alkynylation‐Oxidation Synthesis of 1,2‐Diketones and Consecutive One‐Pot Generation of Quinoxalines
作者:Patrik Niesobski、Ivette Santana Martínez、Sebastian Kustosz、Thomas J. J. Müller
DOI:10.1002/ejoc.201900783
日期:2019.9
A sequentially Pd/Cu‐catalyzed alkynylation‐oxidation reaction furnishes 1,2‐diketones in a one‐pot fashion. This one‐pot process can be successfully concatened with a cyclocondensation to furnish a consecutive multicomponent synthesis of quinoxalines.
B2pin2-mediated copper-catalyzed oxidation of alkynes into 1,2-diketones using molecular oxygen
作者:Yadong Zhai、Zhenni Su、Hao Jiang、Jing Rong、Xianfan Qiu、Chuanzhou Tao
DOI:10.1016/j.tetlet.2019.02.023
日期:2019.3
An intriguing aerobic oxidation of alkynes through copper catalysis is described, in which bis(pinacolato)diboron (B2pin2) played a dominant intermediary role in the formation 1,2-diketones. This novel protocol, which can be performed at room temperature, is versatile for various substituted alkynes, including diarylalkynes and arylalkylalkynes. The mechanism of this reaction was preliminarily investigated
PdI2 in DMSO promoted the oxidation of functionalized diarylalkynes into benzil derivatives in excellent yields. This new oxidation reaction was achieved with short reaction times and low loading of palladium catalyst. This efficient catalytic process has been applied successfully to the one-pot construction of a series of nitrogen-containing heterocycles of biological interest according to a tandem oxidation-nitrogen nucleophiles condensation-cyclization. (c) 2008 Elsevier Ltd. All rights reserved.
Gold-Catalyzed Oxidation of Internal Alkynes into Benzils and its Application for One-Pot Synthesis of Five-, Six-, and Seven-Membered Azaheterocycles
作者:Alexey Yu. Dubovtsev、Dmitry V. Dar'in、Mikhail Krasavin、Vadim Yu. Kukushkin
DOI:10.1002/ejoc.201900108
日期:2019.2.28
Internal alkynes have been shown to undergo oxidation to substituted benzils (1,2‐diarylethane‐1,2‐diones) by α‐picoline N‐oxide in the presence of Ph3PAuNТf2 (5 mol‐%).