Studies on Nilvadipine. II. Synthesis and Structure-Activity Relationships of 2-Hydroxymethyl- and 2-Cyano-1,4-dihydropyridines Containing Heteroatom-Substituted Ester at the 5-Position.
4-Alkyl-1,4-dihydropyridine derivatives as specific PAF-acether antagonists
摘要:
A new series of 4-alkyl-1,4-dihydropyridines (1,4-DHP) were synthesized and evaluated for their ability to inhibit washed rabbit platelet aggregation induced by PAF-acether (1-O-hexadecyl/octadecyl-2-O-acetyl-sn-glycero-3-phosphorylcholine) and to reverse PAF-induced hypotension in anesthetized rats. Additionally, compounds were evaluated for their ability to inhibit the binding of radiolabeled PAF to its receptor on rabbit platelets. Among these compounds, 6I and 6L were the most potent and specific antagonists. At concentrations up to 100 microM, neither compound 6I nor compound 6L caused platelet aggregation nor did they inhibit platelet aggregation induced by collagen or adenosine diphosphate. Compound 6L did not show in vitro calcium channel blocker activity measured on vascular smooth muscle preparations of rabbit aorta and on [3H]nitrendipine binding assays. The compound did not show any cardiovascular effects in anesthetized rat at iv doses up to 1000 micrograms/kg, and the Ki value was 568.62 nmol. These results indicate that compound 6L is a potent and specific PAF antagonist with 1,4-dihydropyridine structure but devoid of a significant cardiovascular activity related to calcium-antagonist properties.
4-alkyl-1,4-dihydropyridines with PAF-antagonist activity
申请人:Alter, S.A.
公开号:US05177211A1
公开(公告)日:1993-01-05
4-alkyl-1,4-dihyropyridines, with PAF-antagonist activity, of formula (I) wherein R is saturated C.sub.1 -C.sub.4, R' is saturated C.sub.1 -C.sub.6 alkyl which may be interrupted by an oxygen atom, or 2-tetrahydrofurfuryl and R.sup.2 is saturated C.sub.1 -C.sub.4 or phenyl, the compound wherein R is methyl, R' is ethyl and R.sup.2 is phenyl remain excluded, are described. The compounds (I) are prepared by: (a) reaction of (II) with (III); (b) reaction of (IV) with (V); (c) reaction of (VI) with (III) and with (VII); (d) reaction of (VIII) with (V) and with (VII); or (e) reaction of (VIII) with (VI) and with (VII) in the presence of ammonia. The compounds (I) are useful due to their antagonist activity of the platelet activating factor. ##STR1##
METHOD OF LABELING SULFENIC ACID-CONTAINING PROTEINS AND PEPTIDES
申请人:Wake Forest University Health Sciences
公开号:US20150346209A1
公开(公告)日:2015-12-03
A method of labeling a sulfenic acid (—SOH) group of a cysteine residue in a protein or peptide, comprises contacting said protein or peptide with a beta-ketoester to covalently couple said beta-ketoester to said cysteine residue and form a beta-ketoester-labeled cysteine residue in said protein or peptide.
4-alkyl-1, 4-dihydropyridines with PAF-antagonist activity
申请人:ALTER, S.A.
公开号:EP0325187A1
公开(公告)日:1989-07-26
4-alkyl-1,4-dihyropyridines, with PAF-antagonist activity, of formula (I) wherein R is saturated C₁-C₄, R′ is saturated C₁-C₆ alkyl which may be interrupted by an oxygen atom, or 2-tetrahydrofurfuryl and R² is saturated C₁-C₄ or phenyl, the compound wherein R is methyl, R′ is ethyl and R² is phenyl remain excluded, are described.
The compounds (I) are prepared by: (a) reaction of (II) with (III); (b) reaction of (IV) with (V); (c) reaction of (VI) with (III) and with (VII); (d) reaction of (VIII) with (V) and with (VII); or (e) reaction of (VIII) with (VI) and with (VII) in the presence of ammonia. The compounds (I) are useful due to their antagonist activity of the platelet activating factor.