Process for preparing enamine derivatives, compounds so produced and process for preparing a 3-hydroxy-cephalosporin
申请人:Lilly Industries Limited
公开号:EP0019401A1
公开(公告)日:1980-11-26
There is described a process for preparing an enamine of formula (IX):
where R2 is a carboxylic acid protecting group and R3 is the residue of a carboxylic acid derived acyl group and where R5 and R6 are the same or different C1-4 alkyl or C7-10 aralkyl groups; or taken together with the adjacent nitrogen atom form a heterocyclic ring containing from 4 to 8 carbon atoms and optionally a further heteroatom selected from oxygen and nitrogen; by reacting a compound of formula (XII) :
with an amine of formula HNR5R6, the reactant of formula (XII) being prepared by reaction of an appropriate enol derivative with a phosphorus reagent. The enamines of formula (IX) are useful in the preparation of 3-hydroxycephalosporins.
Synthesis, electrophysiological properties and analysis of structural requirements of a novel class of antiarrhythmic agents with potassium and calcium channel blocking properties
Class III antiarrhythmic agents have been shown to prevent reentrant arrhythmias but also to be responsible for initiating arrhythmias characterised by afterdepolarizations and triggered activities. By combining potassium and calcium channel antagonistic actions, as with BRL-32872(1,2) (1), it might be possible to reduce the incidence of proarrhythmias albeit retaining antiarrhythmic efficacy. In the present study we synthesised and tested for their electrophysiological activity in guinea pig papillary muscle a wide panel of analogues of BRL-32872. Some qualitative relationships between compound structure and the inhibitory effect on the rapidly activating component of the delayed rectifier potassium current and/or the L-type calcium current will be presented. New derivatives depicting bell-shaped dose-response curves on action potential duration may therefore represent novel agents for improved antiarrhythmic therapy. (C) 1998 Elsevier Science Ltd. All rights reserved.
US4301280A
申请人:——
公开号:US4301280A
公开(公告)日:1981-11-17
Darstellung von Phosphonsäurealkylesteramiden als strukturelle Analoga von Sulfadimidin und Acetophenetidin
作者:Stephan Buseck、Richard Neidlein
DOI:10.1002/ardp.19933260403
日期:——
Die Phosphonsäurealkylesteramide 19 und 36 wurden als strukturelle Analoga von Sulfadimidin und Acetophenetidin dargestellt. 19 wurde nicht durch nukleophile aromatische Substitution erhalten, war jedoch zugänglich durch katalytische Hydrierung des entspr. Nitroderivats. Kondensation von 13 mit aromatischen Aldehyden und nachfolgende Reduktionen lieferte die Amine 26‐28.