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.
Fluorogenic structure activity library pinpoints molecular variations in substrate specificity of structurally homologous esterases
作者:Alex White、Andrew Koelper、Arielle Russell、Erik M. Larsen、Charles Kim、Luke D. Lavis、Geoffrey C. Hoops、R. Jeremy Johnson
DOI:10.1074/jbc.ra118.003972
日期:2018.9
and used this library to systematically interrogate esterase preference for chain length, branching patterns, and polarity to differentiate common classes of esterase substrates. Two structurally homologous bacterial esterases were screened against this library, refining their previously broad overlapping substrate specificity. Vibrio cholerae esterase ybfF displayed a preference for γ-position thioethers
PRODRUGS OF CANNABIDIOL, COMPOSITIONS COMPRISING PRODRUGS OF CANNABIDIOL AND METHODS OF USING THE SAME
申请人:Stinchcomb Audra Lynn
公开号:US20090036523A1
公开(公告)日:2009-02-05
Described herein are cannabidiol prodrugs, methods of making cannabidiol prodrugs, formulations comprising cannabidiol prodrugs and methods of using cannabidiols. One embodiment described herein relates to the transdermal or topical administration of a cannabidiol prodrug for treating and preventing diseases and/or disorders.
Composition for Sterilization Comprising W-Alkoxyperoxycarboxylic Acid
申请人:Kawakami Masayuki
公开号:US20080009549A1
公开(公告)日:2008-01-10
A peroxycarboxylic acid represented by the general formula (I):
(wherein R
1
represents a substituted or unsubstituted C1-C10 alkyl group, or a substituted or unsubstituted C6-C10 aryl group, L represents a substituted or unsubstituted C2-C12 divalent linking group, or R
1
and L may combine to form a ring) and a composition comprising said peroxycarboxylic acid are provided. Said peroxycarboxylic acid can sterilize a medical apparatus such as endoscope in a short period of time and has no unpleasant smell.
Noncyclic polyethers exhibiting lithium ion selectivity have been synthesized. Their competitive alkalimetal-ion transport through liquid membranes has been investigated, and the influence of their structures on the rates and selectivities of cationtransport has been demonstrated. It has been found that the introduction of the oxytrimethylene chain on the polyethers is significant for the appearance
Direct Catalytic Chemoselective α-Amination of Acylpyrazoles: A Concise Route to Unnatural α-Amino Acid Derivatives
作者:Keisuke Tokumasu、Ryo Yazaki、Takashi Ohshima
DOI:10.1021/jacs.5b11773
日期:2016.3.2
carboxylic acid oxidation state substrate, while preactivation by a stoichiometric amount of strong base has been used in catalytic α-aminations. The simultaneous activation of both coupling partners, enolization and metal nitrenoid formation, was crucial for obtaining the product, and wide functional group compatibility highlighted the mildness of the present catalysis. The bidentate coordination mode was