Photo-induced synthesis of β-sulfonyl imides from carboxylic acids
作者:Linwei Zeng、Jian Jin、Jixiao He、Sunliang Cui
DOI:10.1039/d1cc02559g
日期:——
A photo-induced imidation process of carboxylic acids is described. Numerous carboxylic acids could convert to β-sulfonyl imides in the presence of N-sulfonyl ynamides under visible light irradiation. Control experiments and mechanistic studies demonstrate that this imidation process involves a hydroacyloxylation/radical rearrangement cascade. This protocol represents a direct imidation method from
Gold-Catalyzed Intermolecular [4+2] and [2+2+2] Cycloadditions of Ynamides with Alkenes
作者:Ramesh B. Dateer、Balagopal S. Shaibu、Rai-Shung Liu
DOI:10.1002/anie.201105921
日期:2012.1.2
As good as gold: Gold‐catalyzedintermolecular [4+2] cycloadditions of 2‐arylynamides with alkenes and gold‐catalyzed [2+2+2] cycloadditions of terminal ynamides with enol ethers have been developed (see scheme). The [4+2] cycloaddition is compatible with a range of alkenes and arylynamides and the [2+2+2] cycloaddition can also accommodate a variety of different arylynamide and enol ether substrates
palladium-catalyzed [2+1] cycloaddition between ynamides and norbornenes or norbornadienes is reported. Both phosphapalladacycles and palladium/secondary phosphine oxide catalytic systems were found to be competent for the transformation allowing the preparation of aminomethylenecyclopropanes. The reaction showed general applicability to various functionalized bicyclo[2.2.1]hept-2-enes and ynamides. A chiral phosphapalladacycle
at the γ-position, were obtained through addition of terminal ynamides with ethyl diazoacetate under copper catalysis for the first time. Regio- and stereoselective hydroamination of those activated N-allenamides provided exclusively E-configured captodative enamimes through a one-pot anti-Michael addition. Numerous ynamides as well as various secondaryamines were adapted in this process.
Palladium-Catalyzed Addition of 1,3-Diones to Ynamides: An Entry to Alkoxy-Substituted Enamides
作者:Lionel V. Graux、Hervé Clavier、Gérard Buono
DOI:10.1002/cctc.201402398
日期:2014.9
metal‐catalyzed addition reaction of 1,3‐diketones to ynamides, which provides access to unprecedented alkoxy‐substituted enamides, is disclosed herein. A screening of catalytic systems showed that both a phosphapalladacycle and a cationic gold complex were capable of promoting this reaction rapidly and cleanly. The scope investigation revealed that variously substituted terminal ynamides and cyclic 1