Novel Preparation of α,β-Unsaturated Aldehydes. Benzeneselenolate Promotes Elimination of HBr from α-Bromoacetals
作者:Andrei Vasil'ev、Lars Engman
DOI:10.1021/jo9917644
日期:2000.4.1
elimination/hydrolysis of these mixtures afforded alpha,beta-unsaturated aldehydes in 50-80% overall yields. In the case of tertiary alpha-bromoacetals, treatment with benzeneselenolate afforded only dehydrobromination products as mixtures of isomers. The presence of at least a catalytic amount of the organoselenium reagent was found to be crucial for olefin formation. A SET-mechanism, involving benzeneselenolate-induced
An efficient synthesis of ?,?-unsaturated aldehydes by a four-carbon unit extension ofGrignard reagents
作者:Roland Cloux、Manfred Schlosser
DOI:10.1002/hlca.19840670607
日期:1984.9.26
Copper-catalyzed addition of organomagnesium halides to 2-(2,2-diethoxyethyl)oxirane (1) affords aldol acetals 2 which upon acid treatment undergo hydrolysis and dehydration to give α,β-unsaturated aldehydes 7 with high yields.
Intertwining Olefin Thianthrenation with Kornblum/Ganem Oxidations: Ene‐type Oxidation to Furnish α,β‐Unsaturated Carbonyls
作者:Péter Angyal、András M. Kotschy、Ádám Dudás、Szilárd Varga、Tibor Soós
DOI:10.1002/anie.202214096
日期:2023.1.9
A metal-free double oxidation of unactivated alkenes has been developed to deliver unsaturated conjugated carbonyls. This practical procedure allows valorization of the olefinic feedstock with high chemo- and stereoselectivity as demonstrated by the syntheses of difficult-to-access building blocks and industrially relevant pheromones and kairomones.