Enantioselective addition Of diketene to aldehydes promoted by chiral schiff base—titanium alkoxide complex. Application to asymmetric synthesis of potential inhibitors of HMG coenzyme reductase
Highly enantioselective addition of diketene to aldehydes was achieved by using novel Schiff base—titanium alkoxide complexes. Up to 92% ee of 5-hydroxy-3-oxoesters was obtained. This procedure provides an efficient method for the asymmetric synthesis of potential inhibitors of HMG coenzyme reductase.
Substituted pyridyl-dihydroxy-heptenoic acid and its salts
申请人:Bayer Aktiengesellschaft
公开号:US05177080A1
公开(公告)日:1993-01-05
Substituted pyridyl-dihydroxy-heptenoic acid of the formula ##STR1## and its salts, if desired in an isomeric form, have a superior inhibitory action on HMG-CoA reductase and thus bring about a surprisingly good lowering of the cholesterol content in the blood.