Thiol-Promoted Selective Addition of Ketones to Aldehydes
作者:Regev Parnes、Sachin Narute、Doron Pappo
DOI:10.1021/ol502937n
日期:2014.11.21
A simple and efficient thiol-mediated addition of ketones to aromatic and aliphatic aldehydes is reported. This thermodynamically controlled Pummerer/aldolreaction, which can tolerate both moisture and protic functional groups, provides a direct entry to syn-β-thioketones in high chemo- and regioselectivity. Mechanistic studies revealed that selective transformation of the aldehyde to an electrophilic
thioacetals to give the corresponding γ-ketosulfides in good yields with high stereoselectivity. In a similar manner, γ-ketosulfides are obtained in good yields by the one pot reaction directly fromketones and thioacetals via tin(II) enolates.