Highly Regio- and Stereoselective Allylation of α-Diketones via the Fluorosilicate Route
作者:Rainer Gewald、Mitsuo Kira、Hideki Sakurai
DOI:10.1055/s-1996-4151
日期:1996.1
Allylation of enolizable α-diketones with allyltrifluorosilanes in the presence of triethylamine gave the corresponding tertiary homoallyl alcohols in good yield in a highly regio- and stereospecific manner. The reaction proceeds as diallylation with allyltrifluorosilanes yielding the 1,2-diols with high diastereoselectivity. The more sterically demanding crotyl- and prenyltrifluorosilanes lead exclusively to monoallylated products with the allyl group being added γ-regioselectively. In addition, highly diastereoselective crotylation was observed in the formation of the monoallylated α-hydroxy ketones. Asymmetric α-diketones were generally allylated at the less enolized ketone group except when both diketone and allylsilane were sterically hindered.
Tandem Deployment of Indium-, Ruthenium-, and Lead-Promoted Reactions. Four-Carbon Intercalation between the Carbonyl Groups of Open-Chain and Cyclic α-Diketones
作者:José Méndez-Andino、Leo A. Paquette
DOI:10.1021/ol000037o
日期:2000.5.1
An efficient strategy for the conversion of 1,2-diketones into saturated 1,6-diketones and Delta(2,3)/Delta(3,4)-unsaturated congeners thereof is reported.
Intercalation of Multiple Carbon Atoms between the Carbonyls of α-Diketones
作者:Emily P. Balskus、José Méndez-Andino、Ruslan M. Arbit、Leo A. Paquette
DOI:10.1021/jo010494y
日期:2001.10.1
beneficial effect of facilitating removal of ruthenium and phosphorus byproducts generated during the metathesis step. This chemistry conveniently lends itself to the controlled intercalation of multiple methylene groups between the carbonyl carbons of readily available alpha-diketones to deliver linear or cyclic products.