Aminocatalytic Cross-Coupling Approach via Iminium Ions to Different CC Bonds
作者:Nagaraju Mupparapu、Narsaiah Battini、Satyanarayana Battula、Shahnawaz Khan、Ram A. Vishwakarma、Qazi Naveed Ahmed
DOI:10.1002/chem.201405477
日期:2015.2.9
on the ability of such iminium cations to promote reactions via an iminium‐catalyzed or iminium‐equivalent pathway are apparently unavailable. Previously, tandem cross‐coupling reactions were reported, in which an iminium ion undergoes nucleophilic 1,2‐addition to give a putative three‐component intermediate that abstracts a proton in situ and undergoes self‐deamination followed by unprecedented DMSO/aerobic
Iron-Catalyzed ortho-Selective Functionalization of Phenols: A Straightforward Strategy towards the 2′-Hydroxyphenyl-1,2-dione Skeleton
作者:Xingwei Guo、Wenjuan Li、Zhiping Li
DOI:10.1002/ejoc.201001180
日期:2010.10
An iron-catalyzed ortho-functionalization of phenols was developed. The reactions of simple phenols with alpha-hydroxy ketones provide a novel and efficient. method to construct 2';-hydroxyphenyl-1,2-dione derivatives.
Copper-Assisted Synthesis of 2-Hydroxyphenyl-1,2-diones from Phenols and 2-Oxoaldehydes
作者:Narsaiah Battini、Satyanarayana Battula、Qazi Naveed Ahmed
DOI:10.1002/ejoc.201501423
日期:2016.2
An efficient copper(II)‐catalyzed protocol for the ortho‐functionalization of phenols is developed. This method tolerates a wide variety of 2‐oxoaldehydes and phenols and affords the corresponding 2‐hydroxyphenyl‐1,2‐diones in appreciable yields.
The catalytic asymmetriccyclopropanation reaction of alkenes with diazo compounds is a direct and powerful method to construct chiral cyclopropanes that are essential to drug discovery. However, diazo compounds are potentially explosive and often require hazardous reagents for their preparation. Here, we report on the use of 1,2-dicarbonyl compounds as safe and readily available surrogates for diazo