Stereoselective additions of sulphoxides carbonyl compounds
摘要:
The addition of the anions of primary alkyl p-tolyl sulphoxides to aldehydes gave mixtures of all four diastereoisomeric products with low selectivity under a variety of conditions. In contrast, additions of the corresponding t-butyl derivatives afforded just two isomers, with variable stereoselectivity.
Sulfinylmethyl Phosphines as Chiral Ligands in the Intermolecular Pauson−Khand Reaction
作者:Catalina Ferrer、Antoni Riera、Xavier Verdaguer
DOI:10.1021/om900438v
日期:2009.8.10
tert-butyl sulfinylmethyl phosphine ligands is described. Ligands with an extra chiral center in the central carbon atom were prepared by phosphinylation of benzyl and homobenzyl sulfoxides. Ligand exchange reaction of these compounds with Co2-alkyne complexes afforded up to 6:1 dr. The resulting bridged complexes were tested in the intermolecular Pauson−Khandreaction to provide up to 97% ee.