Inhibitors of acyl-CoA:cholesterol acyltransferase. 5. Identification and structure-activity relationships of novel .beta.-keto amides as hypocholesterolemic agents
摘要:
A study of structure-activity relationships of substituted beta-ketoamide ACAT inhibitors I and II was performed. The results of this study suggest that whereas the beta-keto group was tolerated with no loss in activity, beta-hydroxy and oxime moieties led to significantly reduced activity in vitro and in vivo. The most potent inhibitor from the acyclic series (I) (11, IC50 = 0.006 muM) contained a C-13 alkyl chain. This compound reduced plasma total cholesterol by 38% and 66% at 3 and 30 mg/kg, respectively, in cholesterol-fed rats. Dimethylation alpha to the anilide core(5) and subsequent N-methylation of the amide NH (6) decreased in vitro potency significantly. It was also found that high potency was retained with inhibitors which incorporated the carbonyl into a lactam ring (II).
Novel pharmaceutically useful compounds which lower blood cholesterol levels and are beta-ketoamides, oximes, amines, and hydroxyl derivatives thereof.
A new synthesis of substituted 2-hydroxy-1-naphthoic acid esters and amides 4 by oxidation of 5-aryl-3-oxopentanoic acid esters or amides 1 with manganese(III) acetate or cerium(IV) ammonium nitrate has been developed, based on the intramolecular homolytic substitution by α-dicarbonylalkyl radicals generated from high-valent metal β-dicarbonyl complexes.
Chemoselective Aromatic C–H Insertion of α-Diazo-β-ketoesters Catalyzed by Dirhodium(II) Carboxylates
作者:Esdrey Rodriguez-Cárdenas、Rocío Sabala、Moisés Romero-Ortega、Aurelio Ortiz、Horacio F. Olivo
DOI:10.1021/ol202968z
日期:2012.1.6
The ability of alpha-diazo-beta-ketoesters bearing a substituent on the benzylic position to undergo aromatic C-H insertion is described. Good to excellent yields of the aromatic C-H insertion products were observed with Rh-2(tpa)(4) or Rh-2(esp)(2) catalysts. This is an attractive strategy to prepare tetralins carrying a methyl group on the benzylic position, a structural motif found in several types of natural products.