Dimethylzinc-Mediated Addition of Phenylacetylene to α-Diketones Catalyzed by Chiral Perhydro-1,3-benzoxazines
作者:Rebeca Infante、Jose M. Martin-Alvarez、Celia Andrés、Javier Nieto
DOI:10.1021/acs.orglett.7b00252
日期:2017.4.7
An efficient, enantioselective Me2Zn-mediated monoaddition of phenylacetylene to α-diketones in the presence of a chiral perhydro-1,3-benzoxazine ligand is described. At temperatures higher than −20 °C, a kinetic resolution of the resulting α-hydroxyketone occurs, which greatly improves the enantioselectivity although with moderate chemical yield. The alkynylation of nonsymmetrical aromatic diketones