Synthesis of substituted hexa-3,5-dienoic acid methyl esters from conjugated dienones
作者:Rishan Lang Nongkhlaw、Ridaphun Nongrum、Bekington Myrboh
DOI:10.1039/b101242h
日期:——
Substituted hexa-3,5-dienoic acid methyl esters (2) were conveniently prepared in one step by 1,2-carbonyl transposition of the corresponding dienones (1) using lead(IV) acetate and boron trifluoride–diethyl ether in benzene at room temperature.
Ungesättigte Oxime, 24. Mitt. 6-Phenyl-3,5-hexadien-2-one und 7-Phenyl-4,6-heptadien-3-one sowie deren Oxime
作者:Bernard Unterhalt、Klaus Weyrich
DOI:10.1002/ardp.19803131104
日期:——
Substituierte Zimtaldehyde werden mit Aceton und Butanon kondensiert und die Strukturen der ungesättigten Ketone und ihrer Oxime diskutiert.
取代的肉桂醛与丙酮和丁酮缩合,讨论了不饱和酮及其肟的结构。
Multicomponent and Metal‐Free Diels–Alder/Aromatization Approach to the Stereospecific Synthesis of <i>E</i>‐(Hetero)Stilbenes and Diarylacetylenes
作者:Marco Ballarotto、Bruno Cerra、Andrea Temperini
DOI:10.1002/ejoc.202300552
日期:2023.9.21
A straightforward, stereospecific and regioselective strategy for the synthesis of substituted E-stilbenes and diarylacetylenes without the use of metal catalysts was developed. DFT calculations were also performed confirming a concerted [4+2] reaction mechanism of the key ring-forming step.
A regio‐ and enantioselective copper‐catalyzed 1,4‐conjugateaddition of trimethylaluminium to linear δ‐aryl‐substituted α,β,γ,δ‐unsaturated alkyl ketones was developed. A series of γ,δ‐unsaturated alkyl ketones were obtained in good yields with high regio‐ and enantioselectivity (up to 88% ee and 96:4 dr). Expansion of the reaction scope to substrates containing aromatic heterocycles also afforded