Organocatalytic asymmetric Michael addition of 1-acetylcyclohexene and 1-acetylcyclopentene to nitroolefins
作者:Utpal Nath、Ankush Banerjee、Bidhan Ghosh、Subhas Chandra Pan
DOI:10.1039/c5ob00878f
日期:——
The first organocatalytic asymmetric Michael reaction between α-branched enones namely 1-acetylcyclohexene, 1-acetylcyclopentene and 1-acetylcyclobutene with nitroolefins has been developed using primary amines as catalysts.
A new synthesis of α,β-unsaturated ketones. Allylic alkylation of 1-isocyano-1-tosylalkenes
作者:Jarusz Moskal、Albert M van Leusen
DOI:10.1016/s0040-4039(01)81237-5
日期:1984.1
Ketone (1) are homologated to enones 2 by alkylating (introduction of R3) the condensation products 4 (derived from 1 and tosylmethyl isocyanide), followed by acid catalyzed hydrolysis.
The Diels-Alder reaction of 1-cyclobutenyl ketones with various 1,3-dienes in the presence of Lewis acid as a catalyst gave cycloadducts in good yields. 4-Acetylcyclooctadienones and 1-acetyl-1,3,5-cyclooctatrienes are obtained via the bicyclo[4.2.0]octa-2,4-dienes by the transformation to the trimethylsilyl enol ether or the allylic bromination with N-bromosuccinimide followed by dehydrobromination