An improved cobalt catalyst for homo Diels–Alder reactions of acyclic 1,3-dienes with alkynes
作者:Gerhard Hilt、François-Xavier du Mesnil
DOI:10.1016/s0040-4039(00)01163-1
日期:2000.8
cobalt(I)-catalysed homo Diels–Alder reaction of acyclic1,3-dienes and acetylene derivatives is described. The catalyst system consists of a mixture of a readily available CoBr2(dppe) complex, zinc iodide as a cocatalyst, and tetrabutylammonium borohydride as reducing agent. This system increases the reactivity of the cobalt(I) catalyst, so that acyclic dienes and acetylenes can be transformed to the
Cobalt(I)-Catalyzed Diels-Alder, 1,4-Hydrovinylation and 1,4-Hydrosilylation Reactions of Non-Activated Starting Materials on a Large Scale
作者:Gerhard Hilt、Steffen Lüers、Frank Schmidt
DOI:10.1055/s-2003-44373
日期:——
system under ambient reaction conditions is of great value for the chemo- and regioselective generation of interesting building blocks in organic synthesis. Therefore, we present the large-scale application for the cobalt-catalyzed 1,4-hydrovinylation of 1,3-dienes with terminal alkenes (Scheme 1), the cobalt-catalyzed Diels-Alder reactions of various non-activated alkynes with 1,3-dienes and the cobalt-catalyzed