oxidative coupling reaction between formamides and diselenides under metal-free conditions is described. The C–Se bond formation occurred exclusively at the carbonyl carbon by using aqueous tert-butyl hydroperoxide and 4 A molecular sieves and the coupled products, selenocarbamates, were obtained in moderate-to-good yields.
描述了在无金属条件下甲酰胺和二硒化物之间的氧化偶联反应。C-Se 键的形成仅发生在羰基碳上,通过使用水性叔丁基过氧化氢和 4 A 分子筛,并以中等至良好的产率获得了偶联产物硒氨基甲酸酯。
A Palladium-Catalyzed Regio- and Stereoselective Four-Component Coupling Reaction
作者:Daniel J. Knapton、Tara Y. Meyer
DOI:10.1021/jo0484068
日期:2005.2.1
Pd(PPh3)4 catalytically assembles sulfenamide, alkyne, carbon monoxide, and diphenyl diselenide regio- and stereoselectively in a one-pot four-componentcoupling reaction to yield (Z)-β-selenyl acrylamides. The reaction proceeds in good to excellent yields (60−95%) and is tolerant of a range of functional groups on both the nitrogen of the sulfenamide and the alkyne. Moderate selectivities ranging
Palladium-catalyzedregio- and stereoselective selenoacylation of allenes with selenol esters proceeded to produce functionalized allyl selenides with the acyl moiety at the inner carbon and the SePh group at the terminal carbon in high yields. A mechanism accounting for the observed regio- and stereoselectivities is proposed based on the results of DFT calculations.
The Regio- and Stereoselective One-Pot Catalytic Preparation of β-Selenyl Acrylamides
作者:Daniel J. Knapton、Tara Y. Meyer
DOI:10.1021/ol036305a
日期:2004.3.1
Pd(PPh(3))(4) is found to catalytically assemble sulfenamides, terminal aliphatic alkynes, carbon monoxide, and diphenyl diselenides regio- and stereoselectively in a single-pot reaction to produce good yields of beta-selenyl acrylamides. [reaction: see text]
Pd-catalyzed intramolecular selenocarbamoylation of alkynes leading to alpha-alkylidene-beta-lactams was developed. This reaction can be applied to thiocarbamoylation and to the synthesis of delta- and epsilon-lactams and a cyclobutanone.