Stetter Reactions of Unsaturated 1-Acyl-1H-pyrroles
作者:Christopher B. W. Phippen、Anna M. Goldys、Christopher S. P. McErlean
DOI:10.1002/ejoc.201101151
日期:2011.12
α,β-Unsaturated 1-acyl-1H-pyrroles are employed as enabling units for the construction of 1,4-dicarbonyl systems using the organocatalytic Stetterreaction. The enhanced electrophilicity of the 1-acyl-1H-pyrrole unit allows for the catalytic construction of fused and non-fused pyranones from aliphatic aldehydes, is compatible with aromatic aldehydes, and also facilitates an intermolecular variant of
Mild, Efficient, and Greener Dethioacetalization Protocol Using 30% Hydrogen Peroxide in Catalytic Combination with Ammonium Iodide
作者:Nemai C. Ganguly、Pallab Mondal
DOI:10.1080/00397911.2010.502995
日期:2011.8.15
Abstract A simple, mild, efficient, and expedient greener dethioacetalization protocol employing a catalytic amount of nontoxic ammonium iodide (10 mol%) in combination with 30% hydrogen peroxide as terminal oxidizer is revealed. The reagent accomplished facile deprotection of 1,3-dithianes and dithiolanes of activated aromatic substrates in an aqueous medium in the presence of sodium dodecylsulfate
作者:Luisa Benati、Mario Grossi、P. Carlo Montevecchi、Piero Spagnolo
DOI:10.1039/c39820000763
日期:——
Thermolysis of phenyl azide in the presence of sulphides bearing α-hydrogen atoms leads to the formation of significant amounts of 2-substituted anilines, presumably by Sommelet–Hauser type rearrangements of the intermediate N-phenylsulphimides.
Palladium-Catalyzed Intramolecular Aryl Amination Reaction: An Expeditious Approach to the Synthesis of Chiral Benzodiazocine Derivatives
作者:Nirmal Das Adhikary、Partha Chattopadhyay
DOI:10.1002/ejoc.200901472
日期:2010.3
electron-rich aryl halide substrates have been aminated by the intramolecular pathway in good yield using different sugar-derived amines as well as benzylamine. The method is capable of furnishing benzodiazocines in chiral form besides dibenzodiazocine derivatives of potential biological interest.
Transition metal promoted reactions. 38. NiCl2(dppe)-catalyzed geminal dialkylation of dithioacetals and trimethylation of ortho thioesters
作者:Yih Ling Tzeng、Ping Fan Yang、Nai Wen Mei、Tien Min Yuan、Chun Chi Yu、Tien Yau Luh
DOI:10.1021/jo00018a016
日期:1991.8
NiCl2(dppe)-catalyzed cross-coupling of cinnamaldehyde dithioacetals gave the corresponding geminal dimethylation products in excellent yields. Allylic ortho thioesters afforded regioselectively the corresponding trimethylation products. The reaction may occur via an 18-electron pi-allyl intermediate, which undergoes facile reductive elimination to afford the geminal dimethylation product. Benzylic dithioacetals having an ortho amino group gave 2-isopropylanilines exclusively. The reaction of benzylic dithioacetals with EtMgBr under the same conditions yielded geminal diethylation products.