Iodine Promoted Regioselective α-Sulfenylation of Carbonyl Compounds using Dimethyl Sulfoxide as an Oxidant
作者:Yogesh Siddaraju、Kandikere Ramaiah Prabhu
DOI:10.1021/acs.orglett.6b03084
日期:2016.12.2
A metal-free regioselective sulfenylation of the α-CH3 group of ketones has been achieved in the presence of the α-CH2 or α-CH group using the cross dehydrogenative (CDC) strategy. Aldehydes also exhibit good selectivity forming the corresponding α-sulfenylated products. This efficient sulfenylation of ketones or aldehydes with thiones or heterocyclic thiols utilizes dimethyl sulfoxide (DMSO) as an
Zinc Oxide Catalyzed Solvent-Free Mechanochemical Route for C-S Bond Construction: A Sustainable Process
作者:P. Md. Khaja Mohinuddin、N. C. Gangi Reddy
DOI:10.1002/ejoc.201601425
日期:2017.2.24
Zinc oxide-catalyzed solvent-freemechanochemical route has been developed for the rapid construction of C-S bond using a variety of thiols and phenacyl/benzyl/alkyl bromides via a nucleophilic substitution (SN2 mechanism). Notable advantages of this method include broad substrate scope, cleaner reaction profile, safe, scalable, high yields at ambient conditions and reuse of catalyst. Further, the
Transition-Metal-Free Formal Sonogashira Coupling and α-Carbonyl Arylation Reactions
作者:Birgit Prüger、Gretchen E. Hofmeister、Christian Borch Jacobsen、David G. Alberg、Martin Nielsen、Karl Anker Jørgensen
DOI:10.1002/chem.200902911
日期:2010.3.22
Sonogashira coupling and α‐carbonyl arylation reactions have been developed. These transformations are based on the nucleophilic aromatic substitution (SNAr) of β‐carbonyl sulfones to electron‐deficient aryl fluorides, producing a key intermediate that, depending on the reaction conditions, gives the aromatic alkynes or α‐aryl carbonyl compounds. The development of these reactions is presented and, based
Stepwise synthesis and catalysis in C–S cross-coupling of pyridine-functionalized N-heterocyclic carbene nickel(<scp>ii</scp>) complexes by mechanochemistry
作者:Xiaoxiao Cui、Xiujia Hao、Fang Guo
DOI:10.1039/d1dt03651c
日期:——
respectively. A five-coordinated complex [NiLBr]PF6 (3) was further obtained by grinding NH4PF6 with complex 1 or 1′, or grinding KBr with complex 2. Complex 3 can also be obtained by direct grinding of complexes 1/1′ and 2. Complex 3 was subsequently used as a catalyst in the C–S bond cross-coupling of 2-bromoacetophenone and 2-mercaptobenzothiazole. The entire procedure from the synthesis to the catalytic