A convergent regiospecific synthesis of zirconium enolates
作者:Aleksandra Kasatkin、Richard J. Whitby
DOI:10.1016/j.tet.2003.09.022
日期:2003.12
α-Lithiated phenylsulphonyloxiranes insert into alkenylzirconocene chlorides with loss of phenylsulphinate to give zirconyloxiranes which smoothly rearrange by either α- or β- C–O cleavage to afford regiodefined zirconium enolates which may be further elaborated.
no hydroacylations exist that make use of aldehydes without a chelating group, especially when combined with terminal alkynes. Here we report a synergistic nickel–photocatalytic system that allows for the highly regio- and stereoselective hydroacylation of unactivated aldehydes and alkynes in milder conditions without the use of chelating groups.