Cascade Palladium Catalysis: A Predictable and Selectable Regiocontrolled Synthesis of<i>N</i>-Arylbenzimidazoles
作者:Nathan T. Jui、Stephen L. Buchwald
DOI:10.1002/anie.201306007
日期:2013.10.25
choice: The palladium‐catalyzed cascade reaction of 2‐chloroaryl sulfonates with arylamine and amide nucleophiles provides direct access to N‐arylbenzimidazoles. This strategy selectively produces the heterocycles based on chemoselective oxidative addition. 2‐Chloroaryl triflates (Tf) produce one regioisomer and the corresponding 2‐chloroaryl mesylates (Ms) deliver the other in a selectable manner.
Production process of N-substituted amide compounds
申请人:Mitsui Chemicals, Incorporated
公开号:US04835312A1
公开(公告)日:1989-05-30
An N-substituted amide compound is produced with a high yield by initiating a reaction among a starting amide compound such as a saturated or unsaturated, aliphatic or aromatic carboxylic acid amide, a halogen-substituted compound such as an alkyl halide and a strongly basic substance while maintaining the basic substance in a suspended state.
Photoiodocarboxylation of Activated C═C Double Bonds with CO<sub>2</sub> and Lithium Iodide
作者:Rossella Mello、Juan Camilo Arango-Daza、Teresa Varea、María Elena González-Núñez
DOI:10.1021/acs.joc.8b02162
日期:2018.11.2
The photolysis at 254 nm of lithium iodide and olefins 1 carrying an electron-withdrawing Z-substituent in CO2-saturated (1 bar) anhydrous acetonitrile at room temperature produces the atom efficient and transition metal-free photoiodocarboxylation of the C═C double bond. The reaction proceeds well for terminal olefins 1 to form the new C–I and C–C σ-bonds at the α and β-positions of the Z-substituent
achievement of the corresponding enantioselective transformations using the tetraorganosilicon reagents, providing the silicon-based approach to opticallyactiveketones and substituted piperidones that serve as synthetic intermediates of pharmaceuticals. A rhodium alkoxide species is suggested to be responsible for a transmetalation step on the basis of the observed kinetic resolution of a racemic chiral phenylsilane
Rhodium-catalysed 1,4-addition of diarylindium hydroxides to α,β-unsaturated carbonyl compounds
作者:Tomoya Miura、Masahiro Murakami
DOI:10.1039/b511779h
日期:——
Diarylindium(III) hydroxides react with alpha,beta-unsaturated carbonylcompounds in the presence of a rhodium catalyst to afford the 1,4-addition products in high yield. This reaction demonstrates the utility of diarylindium(III) hydroxide as an aryl source with rhodium catalysts.