Synthesis of Oxazoles from Enamides via Phenyliodine Diacetate-Mediated Intramolecular Oxidative Cyclization
摘要:
A group of functionalized oxazoles were synthesized in moderate to good yields from enamides via phenyliodine diacetate (PIDA)-mediated intramolecular cyclization. The main advantageous features of the present method include its broad substrate scope and the heavy-metal-free characteristic of the oxidative carbon-oxygen bond formation process.
Green Esterification of Carboxylic Acids Promoted by
<i>tert</i>
‐Butyl Nitrite
作者:Yonggao Zheng、Yanwei Zhao、Suyan Tao、Xingxing Li、Xionglve Cheng、Gangzhong Jiang、Xiaobing Wan
DOI:10.1002/ejoc.202100326
日期:2021.5.14
TBN‐catalyzed green esterification of carboxylicacids has been developed, which features a broad range of substrates and excellent functional groups tolerance. The mechanistic study confirmed that the nitrous acid formed in situ in the system is the actual catalyst for this transformation.
[EN] PROCESS FOR FORMING A CARBON-CARBON BOND<br/>[FR] PROCÉDÉ DE FORMATION D'UNE LIAISON CARBONE-CARBONE
申请人:UNIV MANCHESTER
公开号:WO2019215426A1
公开(公告)日:2019-11-14
A process for forming a carbon-carbon bond to couple an aryl or heteroaryl group of a first compound with an aryl or heteroaryl group of a second compound, the process comprising reacting the first compound with the second compound in the presence of a catalytically effective amount of a neutral or cationic ruthenium(II) catalyst of formula (I):
Lewis acid-mediated defluorinative [3+2] cycloaddition/aromatization cascade of 2,2-difluoroethanol systems with nitriles
作者:Min-Tsang Hsieh、Kuo-Hsiung Lee、Sheng-Chu Kuo、Hui-Chang Lin
DOI:10.1002/adsc.201701581
日期:2018.4.17
and chemical stability, make derivatization of organic fluorine‐containing compounds by the activation of the C−F bond and subsequent functionalization quite challenging. We herein report a Lewisacid‐mediated defluorinative cycloaddition/aromatization cascade of 2,2‐difluoroethanols with nitriles as a novel synthetic method for the preparation of 2,4,5‐trisubstituted oxazoles. This reaction, which
alkyl ethers has been developed, achieving the challenging tertiary C(sp3)–SCF3 coupling under redox‐neutral conditions. The synergism of organophotocatalyst 4CzIPN and BINOL‐based phosphorothiols can site‐selectively cleave tertiary sp3 C(sp3)–O etherbonds in complex molecules initiated by a polarity‐matching hydrogen‐atom‐transfer (HAT) event. The incorporation of several competing benzylic and methine
Redox-active ligand based Mn(<scp>i</scp>)-catalyst for hydrosilylative ester reduction
作者:Soumi Chakraborty、Arpan Das、Swadhin K. Mandal
DOI:10.1039/d1cc05614j
日期:——
A redox-active ligand-based Mn(i) catalyst initiates a single electron transfer (SET) to split the Si–H bond of PMHS leading to ester hydrosilylation under mild conditions.