Preparation and decarboxylative rearrangement of (Z)-enyne esters
摘要:
A method to assemble (Z)-enyne esters via palladium-catalyzed cross coupling reactions of enol tosylates is reported. A base-mediated one-pot decarboxylative rearrangement of the enynes to enones is described. The scope of this process is examined. (c) 2007 Elsevier Ltd. All rights reserved.
The reaction of benzenesulfonylchlorides with enones was investigated. β-Ionone and benzalacetone in the presence of a palladium catalyst were found to afford the conjugate addition products instead of the expected Heck type products. The reaction tolerates a wide variety of substituents on the benzenesulfonylchloride. It should be noted that no cleavage of the C–Br and C–I bonds was observed in
TiCl4-promoted aldol reaction of ketones as aldol acceptors followed by elimination of the titanoxy group from the Ti-aldolates affords β,β-disubstituted α,β-unsaturated carbonylcompounds in a one-pot procedure. The use of additives, such as DMF, N,N,N′,N′-tetramethylethylenediamine, and pyridine, in the elimination step was found to be important.
Functional group hybrids. Reactivity of .alpha.'-nucleofuge .alpha.,.beta.-unsaturated ketones. 1. Reactions with organocopper reagents
作者:Thomas R. Barbee、Kim F. Albizati
DOI:10.1021/jo00024a014
日期:1991.11
A series of alpha-nucleofuge alpha',beta'-unsaturated ketones encompassing a variety of structural types and nucleofuges was prepared. Treatment of these compounds with lithium dimethylcuprate or methylcopper leads primarily to either reductive cleavage of the alpha-nucleofuge or conjugate addition. Good alpha-nucleofuges favored the reduction pathway while poorer nucleofuges favored conjugate addition.
Shchepin, V. V.; Russkikh, N. Yu.; Gladkova, G. E., Journal of Organic Chemistry USSR (English Translation), 1991, vol. 27, # 9.1, p. 1628 - 1631
作者:Shchepin, V. V.、Russkikh, N. Yu.、Gladkova, G. E.
DOI:——
日期:——
Conjugated acylation of alkylacetylenes by cationoid reagents in the presence of aromatic hydrocarbons
作者:A. A. Shchegolev、V. A. Smit、S. A. Khurshudyan、V. A. Chertkov、V. F. Kucherov