Cobalt(I)-catalyzed 1,4-Hydrovinylation Reactions of 1,3-Dienes with Functionalized Terminal Alkenes under Mild Conditions
作者:Gerhard Hilt、Steffen Lüers
DOI:10.1055/s-2002-23549
日期:——
of acyclic 1,3-dienes with various functionalized terminal alkenes is described. The mild reaction conditions are significant because they considerably reduce the amount of side products and for non acceptor-substituted alkenes the branched products are formed exclusively. The CoBr 2 (dppe) catalyst system controls the regiochemistry of the hydrovinylation process. Unsymmetrical 1,3-dienes yield products
Cobalt-Catalyzed Generation of 1,4-Dienes as Synthons for 1,3-Dicarbonyl Compounds and Their Application in Natural Product Syntheses
作者:Gerhard Hilt、Marion Arndt、Damian Weske
DOI:10.1055/s-0029-1219278
日期:2010.4
The cobalt-catalyzed 1,4-hydrovinylation of alkenes with 1,3-dienes and the cobalt-catalyzed Diels-Alder reaction of alkynes with 1,3-dienes lead to acyclic and cyclic 1,4-dienes, respectively. These products can be transformed into 1,3-dicarbonyl functional groups by ozonolysis or alternative carbon-carbon double bond cleaving reactions. The application towards the synthesis of hepialone and a pyranone-type lipid from Vanilla beans is described.
Cobalt-Catalyzed 1,4-Hydrovinylation of Allylsilane and Allylboronic Esters for the Synthesis of Hydroxy-Functionalized 1,4-Dienes
作者:Marion Arndt、Anne Reinhold、Gerhard Hilt
DOI:10.1021/jo100951d
日期:2010.8.6
4-hydrovinylation reaction of allyl trimethylsilane and allyl pinacol boronic ester with symmetrical and unsymmetrical 1,3-dienes generates building blocks for the in situ allylboration or the Lewis acid induced allylation reaction utilizing the corresponding allylsilanederivatives. The products of these three-component reactions are hydroxy-functionalized 1,4-dienes which can be used for the synthesis of pyranones