FeCl<sub>3</sub>·6H<sub>2</sub>O-Catalyzed Mukaiyama-Aldol Type Reactions of Enolizable Aldehydes and Acetals
作者:Alejandra Rodríguez-Gimeno、Ana B. Cuenca、Jesús Gil-Tomás、Mercedes Medio-Simón、Andrea Olmos、Gregorio Asensio
DOI:10.1021/jo501498a
日期:2014.9.5
stable catalyst, lead to β-methoxycarbonyl compounds with nearly quantitative yields. The methodology is extended to the parent aldehydes as starting materials, leading to the corresponding aldols with lower yields, but efficiently. Different alkyl and aryl substituted acetals and aldehydes have been tested in the reaction with linear and cyclic silyl enolethers. Reactions are carried out in an open air
Stable complexes: An extremely air‐stable μ2‐hydroxy‐bridged binuclear hafonocene perfluorooctanesulfoante complex shows high catalytic efficiency in Lewisacid‐catalyzed reactions, such as esterification, Friedel–Crafts acylation, the Mukaiyama aldol reation, and the allylation of aldehyde (see scheme).
are performed simultaneously on separate reaction sites, has been advanced. Ketones/α,β-enones and aldehydes/acetals are able to react selectively with different silyl nucleophiles in parallel. The subtle differentiation between the substrates possessing similar reactivities has recourse to the strong preference of ketene silyl acetal for ketones/α,β-enones.
Indium-Induced Reaction of Phenacyl Iodide. Deiodinative Dimerization to β,γ-Epoxy Ketone and Aldol Condensation with Aldehydes
作者:Shuki Araki、Yasuo Butsugan
DOI:10.1246/bcsj.64.727
日期:1991.2
The reaction of phenacyl iodide with indium metal gave 3,4-epoxy-1,3-diphenyl-1-butanone which, on treatment with silica gel, gave 2,4-diphenylfuran and 2,4-diphenyl-4-oxobutanal. Metallic indium as well as indium(I) iodide were found to mediate the aldol condensation between α-halo ketone and aldehyde.
Synthetic and mechanistic study on the conjugate isothiocyanation of enones with trimethylsilyl isothiocyanate
作者:Yanmei Li、Diana M. Castañeda-Bagatella、Dhyeyi Kakkad、Yongling Ai、Hao Chen、Pier Alexandre Champagne
DOI:10.1039/d3ob01710a
日期:——
isothiocyanates through the creation of the C–N bond. We have developed a simple approach for the conjugate isothiocyanation of enones by trimethylsilyl isothiocyanate (TMSNCS), which proceeds through the 1,4-addition of the weak isothiocyanate nucleophile to activated enones in the absence of external promoters. This method avoids the direct use of highly toxic acids and bases, produces β-isothiocyanato carbonyl