Construction of Chiral Quaternary Carbon through Morita-Baylis-Hillman Reaction: An Enantioselective Approach to 3-Substituted 3-Hydroxyoxindole Derivatives
作者:Xiao-Yang Guan、Yin Wei、Min Shi
DOI:10.1002/chem.201002240
日期:2010.12.10
A new enantioselectiveapproach to obtain a tetrasubstituted chiral center at the C3 position of oxindoles via a catalytic asymmetric Morita–Baylis–Hillmanreaction has been demonstrated. This reaction provides 3‐substituted 3‐hydroxy‐2‐oxindoles in good to excellent yields and ee values, which could be facilely transformed to pharmaceutically more interesting compounds.
Radical Pentafluoroethylation of Unactivated Alkenes Using CuCF<sub>2</sub>CF<sub>3</sub>
作者:Xinkan Yang、Gavin Chit Tsui
DOI:10.1021/acs.orglett.0c01646
日期:2020.6.5
source for the CF2CF3 radical under aerobic conditions at room temperature. Using this system, readily available unactivatedalkenes can be pentafluoroethylated to provide novel allylic CF2CF3 compounds with excellent E-selectivity and functional group tolerability. Mechanistic studies including TEMPO–CF2CF3 trapping and radical clock experiments provided strong evidence for radical pathways, offering
Regioselective Synthesis of 4-Substituted Indoles via C–H Activation: A Ruthenium Catalyzed Novel Directing Group Strategy
作者:Veeranjaneyulu Lanke、Kandikere Ramaiah Prabhu
DOI:10.1021/ol4031149
日期:2013.12.20
highly regioselective functionalization of indole at the C-4 position by employing an aldehyde functional group as a directing group, and Ru as a catalyst, under mild reaction conditions (open flask) has been uncovered. This strategy to synthesize 4-substitutedindoles is important, as this class of privileged molecules serves as a precursor for ergotalkaloids and related heterocyclic compounds.
Electrochemical reduction of fluoroalkyl sulfones for radical fluoroalkylation of alkenes
作者:Xin Zhou、Chuanfa Ni、Ling Deng、Jinbo Hu
DOI:10.1039/d1cc03258e
日期:——
Radical fluoroalkylation of alkenes has been developed by electrochemical reduction of fluoroalkyl sulfones. A series of electron-deficientalkenes readily undergo hydrofluoroalkylation in good to excellent yields. This chemistry represents the first example of electrochemical generation of fluoroalkyl radicals from sulfones, which are used for practical radical fluoroalkylation of organic compounds
[EN] NEW TRIAZINE AS PHOTO INITIATORS AND THEIR PREPARATION<br/>[FR] NOUVEAUX PHOTO-INITIATEURS EN TRIAZINE ET LEUR PRÉPARATION
申请人:COVESTRO DEUTSCHLAND AG
公开号:WO2016207161A1
公开(公告)日:2016-12-29
The present invention relates to new triazine photoinitiators, a new process for their preparation, and a photopolymer composition comprising a photopolymerizable component and the new triazine photoinitiators. Further aspects of the present invention are a photopolymer comprising said photopolymer composition, a holographic medium which comprises such a photopolymer, a hologram comprising the holographic medium, and a device such a display, chip card, security document, bank note and / or holographic optical element comprising said hologram.