Synthesis and evaluation of new α-methylene-γ-lactone carbamates with NO production inhibitory effects in lipopolysaccharide-induced RAW 264.7 macrophages
摘要:
A series of new alpha-methylene-gamma-lactone carbamates were synthesized by an asymmetric synthetic route. The activities on inhibiting nitric oxide (NO) release of these compounds were evaluated in lipopolysaccharide (LPS)-induced RAW 264.7 macrophages. The results indicated that most of the compounds except one exhibited potent NO inhibitory effect with IC50 value more than 2 mu M. The cytotoxicities of these compounds were estimated via MTT assays. The results suggested that six compounds were accompanied by low cytotoxicity. The structure activity relationships were also discussed. The S configuration of C3 on lactones ring would be more helpful to NO inhibitory effect. (C) 2015 Elsevier Masson SAS. All rights reserved.
Catalytic Asymmetric Synthesis of (+)-Anthecotulide Using Enyne and Meyer–Schuster Rearrangements
作者:David M. Hodgson、Eric P. A. Talbot、Barry P. Clark
DOI:10.1021/ol202425e
日期:2011.11.4
The bioactive sesquiterpene lactone (+)-anthecularin (1) is synthesized for the first time, in a six-step sequence devoid of protecting groups. The key transformations are a novel Rh(I)-catalyzed asymmetric enyne rearrangement of a terminal alkynyl ester (4), to form the alpha-methylene-gamma-butyrolactone core, and a final-step mild Au(I)-catalyzed Meyer-Schuster rearrangement