Development of general methods for the synthesis of new substituted allyl bromides as promising alkenylating agents
作者:A. I. Moskalenko、V. I. Boev
DOI:10.1134/s1070428014070069
日期:2014.7
A general procedure has been developed for the synthesis of hitherto unknown substituted allyl bromides. The procedure includes preparation of the corresponding α,β-unsaturated carboxylic acid esters from accessible ketones according to the Horner-Emmons reaction, reduction of these esters with diisobutylaluminum hydride to allylic alcohols, and substitution of the hydroxy group by bromine by the action
Synthesis of Functionalized Furans via Gold(I)-Catalyzed Claisen-Type Rearrangement
作者:Florin M. Istrate、Fabien L. Gagosz
DOI:10.1021/jo7022685
日期:2008.1.1
Gold(I)-catalyzedcyclization of pentenynyl allyl ethers allows the rapid construction of functionalized furans. The concerted oxy-Claisen-type mechanism induces a complete selectivity of the process and allows the easy formation of quaternary centers.
Gold(I)-catalyzed formation of furans by a Claisen-type rearrangement of ynenyl allyl ethers
作者:Florin M Istrate、Fabien Gagosz
DOI:10.3762/bjoc.7.100
日期:——
A series of ynenyl allyl ethers were rearranged into polysubstituted furans in the presence of a gold(I) catalyst. It is proposed that the transformation involves a Claisen-type rearrangement that allows the efficient creation of quaternary centers under mild experimental conditions.
New reactions of α-allylation of CH-acids with carbonyl groups
作者:A. I. Moskalenko、V. I. Boev
DOI:10.1134/s1070428015020049
日期:2015.2
New α-allylation reactions were performed of CH-acids with carbonyl groups (β-ketoacetic esters, phenylacetone, β-tetralone, ethyl acetate and its α-substituted derivatives) using as deprotonating reagents depending on the substrate acidity sodium hydride, potassium tert-butilate, and sodium bis(trimethylsilyl)-amide. BrCH2CH=CRR′ (R= R′ = H, Me; R = Me, R′ = CH2Ph, CH2CH2Ph) and BrCH2CH=X (X = cyclohexanylidene
3-allylation of tert-butyl 4-oxopiperidine-1-carboxylate
作者:A. I. Moskalenko、V. I. Boev
DOI:10.1134/s1070428014110086
日期:2014.11
Reaction of tert-butyl 4-oxopiperidine-1-carboxylate dimethylhydrazone with BuLi in the presence of N,N'-dimethylpropylene urea and subsequently with BrCH2CH=CRR' (R=H, Me, Et; R'=CH2Ar) afforded in 50-80% yields the corresponding tert-butyl 3-alkenyl-4-oxopiperidine-1-carboxylates, promising synthons for preparation of diverse piperidine derivatives.