A Facile and Practical Synthesis of <i>N</i>-Acetyl Enamides
作者:Wenjun Tang、Andrew Capacci、Max Sarvestani、Xudong Wei、Nathan K. Yee、Chris H. Senanayake
DOI:10.1021/jo902259u
日期:2009.12.18
A facile and practical method for the synthesis of N-acetyl α-arylenamides has been developed from corresponding ketoximes as the starting materials with ferrous acetate as the reducing reagent. This methodology offers mild reaction conditions, simple purification procedures, and high yields for a variety of N-acetyl enamides.
This work reports a simple and efficient method for the direct phosphorylation of enamide under metal-free conditions. The P-centered radicals, derivedfrom secondary phosphine oxides, are generated under mild reaction conditions in the presence of diphenyliodonium salt and Et3N and are introduced onto a range of enamides in good isolated yields. The method features broad substrate scope, good functional
Direct arylation of cyclic enamides via Pd(ii)-catalyzed C–H activation
作者:Hai Zhou、Wan-Jun Chung、Yun-He Xu、Teck-Peng Loh
DOI:10.1039/b903151k
日期:——
A new direct coupling of cyclic enamides with aryl boronic acids viaPd(II)-catalyzed CâH functionalization has been achieved with good yields (up to 90%).
Enamides were efficiently prepared via a novel Rh/C-catalyzed direct hydroacylation of ketoximes. Up to 88% isolated yield of enamides were obtained with this method. Subsequent asymmetric hydrogenation of the enamides with Rh/DuanPhos complex gave the corresponding chiral amine in excellent enantioselectivities (up to 99.7% ee).
endo- and exo-cyclic enamides using stoichiometric amounts of molecular iodine and dichalcogenides at room temperature, completing the reaction within a mere five minutes and in an open-air environment. This method yields a diverse array of sulfenylated and selenated enamide compounds, including 5-phenylsulfanyl and 5-phenylselanyl uracil, under mild and metal-free conditions. Treating the endo-cyclic