Influence of β-arranged substituents in chiral seven-membered rhodium diphosphine rings on asymmetric hydrogenation of amino acid precursors
作者:Hanswalter Krause、Cornelia Sailer
DOI:10.1016/0022-328x(92)83120-7
日期:1992.1
Investigations concerning the optical induction in asymmetrichydrogenation reactions confirm the stereochemical control function of mono- and di-substituents in seven-membered chelateringdiphosphines, whereby the bulkiness of substituents in the backbone of the ligands is reflected in higher enantioselectivities.
phosphine ligands, a Pd-catalyzed asymmetric double hydroxycarbonylation of terminal alkynes to chiralsuccinicacids was achieved in a one-pot manner. The alkyne carbonylation was dictated by the achiral monophosphine to afford branched acrylic acids, while the resulting intermediates further underwent Pd/chiral bisphosphine-catalyzed enantioselective hydroxycarbonylation.
The present invention relates to compounds of formula (I): or pharmaceutically acceptable salts or mixture thereof that inhibit serine protease activity, particularly the activity of hepatitis C virus NS3-NS4A protease.