Discovery of a series of pyrrolidine-based endothelin receptor antagonists with enhanced ETA receptor selectivity
摘要:
Endothelins, ET-1, ET-2, and ET-3 are potent vasoconstricting and mitogenic 21-amino acid bicyclic peptides, which exert their effects upon binding to the ETA and ETB receptors. The ETA receptor mediates vasoconstriction and smooth muscle cell proliferation, and the ETB receptor mediates different effects in different tissues, including nitric oxide release from endothelial cells, and vasoconstriction in certain vascular cell types. Selective antagonists of endothelin receptor subtypes may prove useful in determining the role of endothelin in various tissue types and disease states, and hence as therapeutic agents for such diseases. The pyrrolidine carboxylic acid A-127722 has been disclosed as a potent and ETA-selective antagonist, and is currently undergoing clinical trials. In our efforts to find antagonists with altered selectivity (ETA-selective, ETB-selective, or nonselective), we investigated the SAR of the 2-substituent on the pyrrolidine. Compounds with alkyl groups at the 2-position possessed ETA selectivity improved over A-127722 (1400-fold selective), with the best of these compounds showing nearly 19,000-fold selectivity. (C) 1999 Elsevier Science Ltd. All rights reserved.
Alkoxydiaminophosphine Ligands as Surrogates of NHCs in Copper Catalysis
作者:Juan Diego Pizarro、Francisco Molina、Manuel R. Fructos、Pedro J. Pérez
DOI:10.1002/chem.202001517
日期:2020.8.12
A family of phosphine ligandscontaining a five‐membered ring similar to the popular N‐heterocyclic carbene ligands and an alkoxy third substituent has been developed. These alkoxydiaminophosphine ligands (ADAP) can be generated in one pot and reacted with a copper(I) source leading to the high yield isolation of complexes [(ADAP)CuX]2 (X=Cl, Br). The dinuclear nature of these compounds has been established
Highly Regioselective Functionalization of Aliphatic Carbon−Hydrogen Bonds with a Perbromohomoscorpionate Copper(I) Catalyst
作者:Ana Caballero、M. Mar Díaz-Requejo、Tomás R. Belderraín、M. Carmen Nicasio、Swiatoslaw Trofimenko、Pedro J. Pérez
DOI:10.1021/ja0291484
日期:2003.2.1
The complex Tp(Br3)Cu(NCMe) (1) is an excellent catalyst for the regioselective carbene transfer reaction to tertiary C-H bonds of hydrocarbons, at room temperature, using the readily available ethyldiazoacetate (EDA) as the carbene source.
A compound of the formula (I): ##STR1## or a pharmaceutically acceptable salt thereof is disclosed, as well as processes for and intermediates in the preparation thereof, and a method of antagonizing endothelin.