Pyridazinyl phenyl hydrazones useful against congestive...

C - Chemistry – Metallurgy – 07 – D

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C07D 237/04 (2006.01) A61K 31/50 (2006.01) A61P 9/04 (2006.01) C07D 237/32 (2006.01)

Patent

CA 2403188

Therapeutically active compounds of formula (I) in which R1 to R4 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, carboxyalkyl, hydroxyalkyl or halogenalkyl, or R2 and R3 form a ring of 5-7 carbon atoms, R5 to R9 means hydrogen, alkyl, alkenyl, aryl, arylalkyl, acyl, hydroxy, alkoxy, alkoxycarbonyl, amino, acylamino, alkylamino, aryloxy, halogen, cyano, nitro, carboxy, alkylsulfonyl, sulfonamido or trifluoromethyl, wherein each aryl residue defined above by itself or as a part of another group may be substituted, and pharmaceutically acceptable salts and esters thereof. The compounds increase the calcium sensitivity of contractile proteins of the cardiac muscle and are thus useful in the treatment of congestive heart failure.

L'invention concerne des composés thérapeutiquement actifs représentés par la formule (I), dans laquelle R¿1? à R¿4? représentent hydrogène, alkyle, alcényle, aryle, arylalkyle, carboxyalkyle, hydroxyalkyle ou halogénalkyle, ou R¿2? et R¿3? forment un noyau de 5 à 7 atomes de carbone, R¿5? à R¿9? représentent hydrogène, alkyle, alcényle, aryle, arylalkyle, acyle, hydroxy, alcoxy, alcoxycarbonyle, amino, acylamino, alkylamino, aryloxy, halogène, cyano, nitro, carboxy, alkylsulfonyle, sulfonamido ou trifluorométhyle, chaque résidu aryle défini plus haut comme tel ou faisant partie d'un autre groupe pouvant être substitué ; ainsi que des sels et des esters pharmaceutiquement acceptables des composés. Ces composés augmentent la sensibilité au calcium de protéines contractiles du muscle cardiaque, et sont par conséquent utiles dans le traitement de l'insuffisance cardiaque.

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