Discovery of a nonpeptidic small molecule antagonist of the human platelet thrombin receptor (PAR-1)
摘要:
The synthesis and biological evaluation of a series of nonpeptidic small molecule antagonists of the human platelet thrombin receptor (PAR-1) are described. Optimization of the 5-amino-3-arylisoxazole lead resulted in an approximate 100-fold increase in potency. The most potent of these compounds (54) inhibits platelet activation with IC50S of 90 nM against the thrombin receptor agonist peptide (TRAP) and 510 nM against thrombin as the agonist. Further, antagonist 54 fully blocks platelet aggregation stimulated by 1 nM thrombin for 10 min. (C) 2002 Published by Elsevier Science Ltd.
Rh(III)-Catalyzed Regioselective Annulations of 3-Arylisoxazolones and 3-Aryl-1,4,2-dioxazol-5-ones with Propargyl Alcohols: Access to 4-Arylisoquinolines and 4-Arylisoquinolones
The Rh(III)-catalyzed dual directing group assisted C–H activation/annulation of 3-arylisoxazolones with propargyl alcohols has been developed, which expands the application scope of isoxazolones in organic synthesis. This protocol also worked well with 3-aryl-1,4,2-dioxazol-5-ones to produce synthetically and biologically important 4-arylisoquinolones.
Rh(III)-Catalyzed [4 + 2] Annulation of 3-Aryl-5-isoxazolone with Maleimides or Maleic Ester
作者:Ting Wan、Chao Pi、Yangjie Wu、Xiuling Cui
DOI:10.1021/acs.orglett.0c02283
日期:2020.8.21
The Rh(III)-catalyzed [4 + 2] annulation of 3-aryl-5-isoxazolones with maleimides or maleic ester has been developed, which gives synthetically important 3,4-dihydroisoquinoline derivatives in good to excellent yields. This facile protocol can tolerate a variety of functional groups, and CO2 was produced as the predominant byproduct. Notably, a C–C bond and a C–N bond were formed simultaneously. This
作者:Wen-Ting Meng、Yan Zheng、Jing Nie、Heng-Ying Xiong、Jun-An Ma
DOI:10.1021/jo302419e
日期:2013.1.18
A facile one-pot sequential conjugate addition/dearomative fluorination transformation of isoxazol-5(4H)-ones with nitroolefins and N-fluorobenzenesulfonimide (NFSI) has been developed. By using a bifunctional chiral tertiary amino-thiourea catalyst, a series of chiral fluorinated isoxazol-5(4H)-ones containing one fluorine-substituted quarternary stereocenter were obtained in high yields with high