Ezetimibe analogs with a reorganized azetidinone ring: Design, synthesis, and evaluation of cholesterol absorption inhibitions
摘要:
The underlying principle of drug design in this paper is that the maximum retention of the functional groups that exist in the marketed drug would provide a higher probability for comparable safety while the conformational changes in the newly created analogs should not constitute a significant structural variation to adversely affect biological activity. Four individual isomers of backbone re-organized ezetimibe analogs were designed and synthesized. Their effects on the cholesterol levels in rat serum were evaluated by a high-cholesterol and high-fat diet feeding experiment. All the new analogs showed significant effect in lowering the levels of total cholesterol in serum. (c) 2006 Elsevier Ltd. All rights reserved.
Ezetimibe analogs with a reorganized azetidinone ring: Design, synthesis, and evaluation of cholesterol absorption inhibitions
摘要:
The underlying principle of drug design in this paper is that the maximum retention of the functional groups that exist in the marketed drug would provide a higher probability for comparable safety while the conformational changes in the newly created analogs should not constitute a significant structural variation to adversely affect biological activity. Four individual isomers of backbone re-organized ezetimibe analogs were designed and synthesized. Their effects on the cholesterol levels in rat serum were evaluated by a high-cholesterol and high-fat diet feeding experiment. All the new analogs showed significant effect in lowering the levels of total cholesterol in serum. (c) 2006 Elsevier Ltd. All rights reserved.
[EN] PROCESS FOR PREPARING AN ANTI-HYPERCHOLESTEROLEMIC COMPOUND<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN COMPOSÉ ANTI-HYPERCHOLESTÉROLÉMIANT
申请人:MERCK & CO INC
公开号:WO2009054887A1
公开(公告)日:2009-04-30
The present invention relates to a process for preparing inhibitors of cholesterol absorption of Formula II: II and the pharmaceutically acceptable salts and esters thereof, employing a metal-catalyzed dynamic kinetic resolution (DKR) asymmetric transfer hydrogenation (ATH) reaction of racemic acyclic ß-ketoamide bearing a-substituted aliphatic side chain (Intermediate A) and subsequent cyclization of the resulting b-hydroxyamide product (Intermediate B), followed by a synthesis involving two consecutive cross-coupling reactions.
Dynamic Kinetic Resolution: Asymmetric Transfer Hydrogenation of α-Alkyl-Substituted β-Ketoamides
作者:John Limanto、Shane W. Krska、Benjamin T. Dorner、Enrique Vazquez、Naoki Yoshikawa、Lushi Tan
DOI:10.1021/ol902715d
日期:2010.2.5
Dynamic kinetic resolution (deracemization) of various alpha-alkyl-substituted beta-ketoamides 1 via asymmetric transfer hydrogenation proceeded efficiently to give the corresponding syn-beta-hydroxy amides 3 in high diastereo- and enantioselectivities. Specifically, subjection of 1 to HCO2H and Et3N in the presence of 0.5-1 mol % of pentafluorobenzenesulfonyl-DPEN-Ru catalyst 2b at 30-40 degrees C in either PhCH3 or CH2Cl2 generated the syn-hydroxy product 3 selectively in 15-33:1 dr, 93-97% ee, and 75-88% isolated yields.
Ezetimibe analogs with a reorganized azetidinone ring: Design, synthesis, and evaluation of cholesterol absorption inhibitions
作者:Xianxiu Xu、Renzhong Fu、Jin Chen、Shengwu Chen、Xu Bai
DOI:10.1016/j.bmcl.2006.09.078
日期:2007.1
The underlying principle of drug design in this paper is that the maximum retention of the functional groups that exist in the marketed drug would provide a higher probability for comparable safety while the conformational changes in the newly created analogs should not constitute a significant structural variation to adversely affect biological activity. Four individual isomers of backbone re-organized ezetimibe analogs were designed and synthesized. Their effects on the cholesterol levels in rat serum were evaluated by a high-cholesterol and high-fat diet feeding experiment. All the new analogs showed significant effect in lowering the levels of total cholesterol in serum. (c) 2006 Elsevier Ltd. All rights reserved.