By using the iridium complex of a phosphine-oxazoline ligand with an axis-unfixed biphenyl backbone, a highlyenantioselectivehydrogenation of the CC bond of exocyclic α,β-unsaturated carbonyl compounds to afford α-chiral cyclic ketones, lactones and lactams was developed.
The O-alkoxycarbonylation of lithiumenolates of α-disubstituted aryl ketones was selectively obtained when the enolates, prepared in using lithium bis(trimethylsilyl)amide, were added to chilled THF solutions of allyl or benzyl chloroformates.
A new reaction: A ruthenium-catalyzed transfer of an alkyl group from a trialkylamine to the α-carbon atom of a ketone leads in good yields to α-alkylated ketones [Eq. (1)]. The reaction is applicable to a wide range of alkyl(alkyl), alkyl(aryl), and cyclic ketones, and in the case of unsymmetrical ketones it takes place regioselectively at the less hindered α-position.
Henin Francoise, MBoungo-MPassi Athanase, Muzart Jacques, Pete Jean-Pierr+, Tetrahedron, 50 (1994) N 9, S 2849- 2864
作者:Henin Francoise, MBoungo-MPassi Athanase, Muzart Jacques, Pete Jean-Pierr+
DOI:——
日期:——
COUDERT G., 14E SEMAINE ETUDE CHIM. ORG., NICE, 1977, 21-22