Well-Designed Phosphine–Urea Ligand for Highly Diastereo- and Enantioselective 1,3-Dipolar Cycloaddition of Methacrylonitrile: A Combined Experimental and Theoretical Study
A novel chiral phosphine-urea bifunctional ligand has been developed for Cu-catalyzed asymmetric 1,3-dipolar cycloaddition of iminoesters with methacrylonitrile, a long-standing challenging substrate in asymmetric catalysis. Distortion-interaction energy analysis based on density functional theory (DFT) calculations reveals that the distortion energy plays an important role in the observed enantioselectivity
N-Substituted 3-Acetyltetramic Acid Derivatives as Antibacterial Agents
作者:Raghunandan Yendapally、Julian G. Hurdle、Elizabeth I. Carson、Robin B. Lee、Richard E. Lee
DOI:10.1021/jm701356q
日期:2008.3.13
expand the structure-activity relationship of tetramic acid molecules with structural similarity to the antibiotic reutericyclin, 22 compounds were synthesized and tested against a panel of clinically relevant bacteria. Key structural changes on the tetramic acid core affected antibacterial activity. Various compounds in the N-alkyl 3-acetyltetramic acid series exhibited good activity against Gram-positive
Does the Reaction of Cyclopropyl Acid Chlorides and Imines To Form 1,3-Oxazin-4-enone Heterocycles Proceed via a Ketene or an <i>N</i>-Acyl-iminium Mechanism?
作者:Alexander J. Craig、Andrew P. Cording、Anna L. Garden、Bill C. Hawkins
DOI:10.1021/acs.joc.0c00229
日期:2020.4.17
3-oxazin-4-enones was probed through physical and computational experiments. The data gathered strongly support the reaction proceeding through an N-acyl iminium intermediate mechanism rather than a ketene intermediate mechanism.
Imidazole angiotensin II antagonists incorporating a substituted benzyl
申请人:Merck & Co., Inc.
公开号:US05183810A1
公开(公告)日:1993-02-02
Substituted imidazoles attached through a methylene bridge to novel substituted phenyl derivatives of the Formula I, are useful as angiotensin II antagonists. ##STR1##
通过亚甲基桥连接到新的取代苯基衍生物的咪唑替代物,可用作血管紧张素II拮抗剂。##STR1##
Quinoline angiotensin II antagonists incorporating a substituted benzyl
申请人:Merck & Co., Inc.
公开号:US05246944A1
公开(公告)日:1993-09-21
Substituted quinolines and azaquinolines (1,5-naphthridines) attached through an oxymethylene bridge to novel substituted phenyl derivatives of the Formula I, are useful as angiotensin II antagonists. ##STR1##