Copper-mediated regio- and enantio-selective cross-coupling of heterocyclic allyl sulphides with organomagnesium compounds: A case of 1,7-relative stereogenesis
作者:Vincenzo Caló、Angelo Nacci、Vito Fiandanese
DOI:10.1016/0040-4020(96)00601-1
日期:1996.8
Optically active heterocyclic allylsulphides 1–7 react with organomagnesium compounds in the presence of CuBr to afford optically active alkenes in good yields and very high γ-selectivity. The regioselectivity depends on the solvent as well on the CuBr: allylicsulphide ratio. The heterocyclic nucleus imparts asymmetric induction in the range of 50–98% ee. The regio- and enantio-selectivity of these
Radical‐mediated Hydrogen Atom Abstraction of Csp3−H bonds has become a powerful tool for the asymmetric functionalization of organic feedstocks. Here, we present an asymmetric synthesis of α‐aryl amides via carbamoylation of alkylarenes with isocyanates as electrophiles. The synergistic combination of a photoredox and a chiral nickel‐catalyst, enables the use of readily available and neutral reagents under mild reaction conditions and provides straightforward access to pharmacologically relevant motifs in enantiomerically pure form.