2-Azetidinone Cholesterol Absorption Inhibitors: Structure−Activity Relationships on the Heterocyclic Nucleus
摘要:
A series of azetidinone cholesterol absorption inhibitors related to SCH 48461 ((-)-6) has been prepared, and compounds were evaluated for their ability to inhibit hepatic cholesteryl ester formation in a cholesterol-fed hamster model. Although originally designed as acyl CoA: cholesterol acyltransferase (ACAT) inhibitors, comparison of in vivo potency with in vitro activity in a microsomal ACAT assay indicates no correlation between activity in these two models. The molecular mechanism by which these compounds inhibit cholesterol absorption is unknown. Despite this limitation, examination of the in vivo activity of a range of compounds has revealed clear structure-activity relationships consistent with a well-defined molecular target. The details of these structure-activity relationships and their implications on the nature of the putative pharmacophore are discussed.
α-Acyl-α-diazoacetates in Transition-Metal-Free β-Lactam Synthesis
作者:Judith Synofzik、Dmitry Dar’in、Mikhail S. Novikov、Grigory Kantin、Olga Bakulina、Mikhail Krasavin
DOI:10.1021/acs.joc.9b02030
日期:2019.9.20
Thermally promoted reaction of α-acyl-α-diazoacetates with imines has been investigated. The transformation, earlier reported predominantly under transition metal catalyzed conditions, delivers α-alkoxycarbonyl-substituted β-lactams with outstanding diastereoselectivity. DFT calculations performed in order to evaluate energetically feasible reaction pathways revealed the intermediacy of 1,3-oxazin-4-one