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
Enantioselective synthesis of deltacyclenes using a [CoI2:Zn] catalytic system
作者:Olivier Pardigon、Gérard Buono
DOI:10.1016/s0957-4166(00)82243-0
日期:1993.1
alkynes 2, affording tetracyclic compounds called “deltatcyclenes” 3. In this [2+2+2) cycloadditions, stereochemical control is achieved through the presence of catalytic amount of homochiral mono and bidentate ligands leading to deltacyclenes in high chemical and optical yields.