Abstract

The efficient chiral catalyst [CoI 2;Zn/(L*) n] readily promotes the homo Diels-Alder reactions between norbornadiene 1 and 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.

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