摘要:
A stereoselective process for the preparation of antihypercholesterolemic agents of the HMG-CoA reductase inhibitor type comprises treatment of an intermediate .beta.-hydroxyketone with a trialkylborane and sodium borohydride at low temperatures.
摘要:
This invention relates to a novel process for the preparation of 3-hydroxy-3-methylglutarylcoenzyme A (HMG-CoA) reductase inhibitors which contain a 4-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one moiety, such as compactin and mevinolin, by utilizing an alkyl 4-cyano-3(R)-hydroxybutanoate as a chiral synthon for the stereospecific introduction of the 4-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one moiety.
摘要:
This invention relates to a novel process for the preparation of 3-hydroxy-3-methylglutarylcoenzyme A (HMG-CoA) reductase inhibitors which contain a 4-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one moiety, such as compactin and mevinolin, by utilizing an alkyl 4-halo-3(S)-hydroxybutanoate as a chiral synthon for the stereospecific introduction of the 4-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one moiety.
摘要:
A novel process for the preparation of intermediates in the totally synthetic antihypercholesterolemic agents, 6-[2-[1,1'-biphenyl]-2-yl-ethenyl] pyranones, involving a highly efficient nickel catalyzed aryl cross-coupling reaction is disclosed.
摘要:
The compound 6(R)-[2-8(S)(2,2-dimethylbutyryloxy)-2(S),6(S)-dimethyl-1,2,3,4,4a(S),5,6,7,8,8a(S)-decahydronaphthyl-1(S)ethyl]-4(R)-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one is prepared in two steps from mevinolin and comprise reduction of the two double bonds and C-methylation of the 8(S)-(2-methylbutyryloxy) group to form the 2,2-dimethylbutyryloxy group. The two steps can be performed in either order.
摘要:
The bisulfate salt of N,N-dimethyl-2-�5-(1,2,4-triazol-1-ylmethyl)-1H-indol-3-yl!ethylamine is a selective agonist of 5-HT.sub.1 -like receptors and is useful in the treatment of migraine and associated disorders.
摘要:
.beta.- or .gamma.-Ketoesters and .beta.- or .gamma.-ketoamides are asymmetrically reduced with a Ru(II)-BINAP derived catalyst at about 40.degree. C. and about 50 N/mm.sup.2 of hydrogen in the presence of a strong acid.
摘要翻译:在强酸存在下,在约40℃和约50N / mm 2的氢气下使用Ru(II)-BINAP衍生的催化剂不对称地还原β-或γ-甲酯和β-酮酰胺。
摘要:
A process of synthesizing a compound of the formula 1: ##STR1## is disclosed, which comprises reacting a compound of the formula 2: ##STR2## with diphenylphosphine in the presence of an amine base and a nickel catalyst to produce a compound of formula 1.
摘要:
A novel acylation process using an alkali metal bromide and a dialkylaminopyridine to form a sterically hindered ester functionality from an alkanoyl chloride and an alcohol is disclosed.
摘要:
A novel hydrogenation process, using a homogenous iridium or rhodium catalyst for selectively adding hydrogen to the 3,5 positions in the polyhydronaphthyl ring of lovastatin, simvastatin or C-8-acyl or C-6-substituted analogs thereof, is disclosed.