Regioselective Arene and Heteroarene Functionalization: <i>N</i>-Alkenoxypyridinium Salts as Electrophilic Alkylating Agents for the Synthesis of α-Aryl/α-Heteroaryl Ketones
作者:Rong L. Zhai、Yun S. Xue、Ting Liang、Jia J. Mi、Zhou Xu
DOI:10.1021/acs.joc.8b01388
日期:2018.9.7
electrophilic alkylating agents for the synthesis of α-aryl/heteroaryl ketones has been developed. The method generates alkylating agents from alkynes and N-pyridine oxide followed by site-selective electrophilic substitution with a broad range of arenes and heteroarenes including benzene derivates, phenols, ethers, indoles, pyrroles, furans, and thiophenes in onepot. Kinetic isotope effect measurements
Synthesis of carbonyl compounds using organomanganese pentacarbonyl complexes.
作者:Philip DeShong、Greg A Slough、Arnold L Rheingold
DOI:10.1016/s0040-4039(00)96087-8
日期:1987.1
Sequentialinsertion of carbonmonoxide and either strained or electron-deficient alkenes; into alkylmanganese pentacarbonyl complexes at pressures of 6 kbar provides manganacycles in a regioselective and stereoselective fashion. The manganacycles can be transformed into carbonyl compounds under photolytic conditions.
Promoting Catalytic <i>C</i>-Selective Sulfonylation of Cyclopropanols against Conventional <i>O</i>-Sulfonylation Using Readily Available Sulfonyl Chlorides
作者:Thangeswaran Ramar、Andivelu Ilangovan、Murugaiah A. M. Subbaiah
DOI:10.1021/acs.joc.3c01230
日期:2023.10.6
β-sulfonylation of cyclopropanols by a mechanism that potentially involves an oxidative addition of a sulfonyl radical to a metal homoenolate. Unlike reported methods, this protocol allows a practical synthetic route to γ-keto sulfone building blocks from cyclopropanols by leveraging commercially available aryl- and alkyl-sulfonyl chlorides, common reagents in organic chemistry laboratories. Using
oxidant-free reaction of cyclopropanols, DABCO ⋅ (SO2)2 and diaryliodoniumsalts in aqueous phase is described. This reaction proceeds under mild reaction conditions, affording bioactive aryl substituted γ-keto sulfones in 36%-90% yields with good functional group tolerance. This reaction proceeds through a γ-keto sulfinate intermediate, which undergoes a nucleophilic reaction with diaryliodoniumsalts, giving
Efficient Synthesis of γ-Keto Sulfones by NHC-Catalyzed Intermolecular Stetter Reaction
作者:Anup Bhunia、Santhivardhana Reddy Yetra、Sachin Suresh Bhojgude、Akkattu T. Biju
DOI:10.1021/ol301045x
日期:2012.6.1
The N-heterocyclic carbene-catalyzed intermolecular Stetter reaction of aldehydes with alpha,beta-unsaturated sulfones allows the atom-economic and selective formation of gamma-keto sulfones in good yields. Key to the success of this unique transition-metal-free carbon-carbon bond-forming reaction is the right choice of the NHC precursor and base. The reaction tolerates a broad range of different aldehydes.