β-Ketolactone synthons. Short efficient syntheses of jasmonoids.
作者:David J. Goldsmith、John K. Thottathil
DOI:10.1016/s0040-4039(01)92929-6
日期:1981.1
The cyclopentanoid β-ketolactone , serving as the equivalent of a specific enolate of a 3-alkyl cyclopentanone, has been converted to several jasmonoid substances.
Dehydrojasmone 1a and nor-methyl dehydrojasmone 1b have been prepared by action of a peracid on appropriately substituted vinylallenes. Several pathways to these hydrocarbons are described.
Synthèse de monodioxolannes de dicétones-1,4 et de dicétones-1,4 au moyen des anhydrides mixtes carboxyliques et carboniques: application à la
作者:J.-L. Moreau、R. Couffignal、R. Arois-Chtara
DOI:10.1016/s0040-4020(01)92014-9
日期:1981.1
Levulinic acid 1 is easily converted by two steps into mixed carboxylic and carbonic anhydride 3 which reacts with the organolithium reagent issued from trimethylsilyl esters Monoethylene acetal of 1,4-diketones 4 can be prepared; it is also possible to obtain 1,4-diketones 5 in one step by hot acid hydrolysis. The preparation of the dihydrojasmone 6d, Z-jasmone 6eand dehydrojasmone 6f shows the efficiency
New process for the preparation of cyclic ketones possessing interesting organoleptic properties and including methyl 2-(cis-pent-2-enyl)-3-oxo-cyclopentylacetate and 3-methyl-2-(cis-pent-2-enyl)-cyclopent-2-enone, better known in the perfume industry as cis-methyl jasmonate and cis-jasmone respectively.