Pyrido[2,1-b]quinazolinecarboxamide derivatives as platelet activating factor antagonists
摘要:
A series of N-[(heteroaryl)alkyl]pyrido[2,1-b]quinazolines were evaluated for their ability to inhibit the binding of radiolabeled platelet activating factor (PAF) to its receptor on dog platelets. The most potent compounds in this series were found to be pyrido[2,1-b]quinazoline-8-carboxamides possessing a four- or six-carbon chain between the carboxamide nitrogen atom and a 3-pyridinyl or 5-pyrimidinyl moiety. Since earlier metabolism studies with pyridoquinazolinecarboxamides suggest that the carboxamide moiety is labile to hydrolysis in vivo, attempts were made to find isosteric replacements for this group. The substitutions examined led to a loss of activity; however, insertion of a methyl group on the carbon atom alpha to the carboxamide nitrogen led to an enantioselective enhancement of potency. (R)-2-(1-Methylethyl)-N-[1-methyl-4-(3-pyridinyl)butyl]-11-oxo-11H- pyrido[2,1-b]quinazoline-8-carboxamide (34) was more potent than the corresponding S enantiomer in the PAF binding assay and was also shown to be more resistant to degradation by amidases present in whole liver homogenates obtained from guinea pig, dog, and squirrel monkey. The corresponding rac-2-(1-methylethyl)-N-[1-methyl-4-(3-pyridinyl)butyl]-11-oxo-11H- pyrido[2,1-b]quinazoline-8-carboxamide (33) was found to inhibit transient PAF-induced thrombocytopenia and decreases in blood pressure in guinea pigs after intravenous or oral administration and to have a duration of action of greater than 5 h after an oral dose of 200 mg/kg. Compound 33 thus represents the prototype of a new class of orally active PAF antagonists.
Derivatives of 4-acetyl-3-hydroxy-2-alkyl-phenoxycarboxylic acids
申请人:Hoffmann-La Roche Inc.
公开号:US04672066A1
公开(公告)日:1987-06-09
The invention relates to compounds of the formula ##STR1## wherein R is hydrogen or lower alkyl, Y is alkylene; Z is alkylene, ##STR2## the asterisk herein denotes bonding to the substituted acetophenone; R.sub.2 is hydrogen or lower alkoxy; and n is an integer of 1 to 3; A is ##STR3## and HET is a 5-or 6- membered nitrogen containing heterocyclic group, and their acid addition salts. The compounds of formula I of the invention are useful for the treatment of allergic conditions, such as, asthma and cardiovascular diseases, such as, angina and arrhythmias.
Omega-[(hetero)alkyl]benz[cd]indol-2-amines useful in inhibition of thromboxane synthetase and in treatment of hypertension in warm-blooded animals are disclosed.
公开了可用于抑制血栓素合成酶和治疗温血动物高血压的ω-[(杂)烷基]苯并[cd]吲哚-2-胺。
TILLEY, JEFFERSON W.;BURGHARD, BARBARA;BURGHARDT, CHARLES;MOWLES, THOMAS +, J. MED. CHEM., 31,(1988) N 2, 466-472
作者:TILLEY, JEFFERSON W.、BURGHARD, BARBARA、BURGHARDT, CHARLES、MOWLES, THOMAS +
DOI:——
日期:——
TILLEY J. W. LEVITAN P.; LIND J.; WELTON A. F. CROWLEY H. J.; TOBIAS L. D+, J. MED. CHEM., 30,(1987) N 1, 185-193
作者:TILLEY J. W. LEVITAN P.、 LIND J.、 WELTON A. F. CROWLEY H. J.、 TOBIAS L. D+