Novel Calcium Antagonists with Both Calcium Overload Inhibition and Antioxidant Activity. 2. Structure−Activity Relationships of Thiazolidinone Derivatives
摘要:
CP-060 (1), 2-(3,5-di-tert-butyl-4-hydroxyphenyl)-3-[3-[N-methyl-N-[2-[3,4-(methylenedioxy)phenoxy]ethyl]amino]propyl]-1,3-thiazolidin-4-one, is a novel type of Ca2+ antagonist possessing both Ca2+ overload inhibition and antioxidant activity. The structure-activity relationships for this series of compounds were studied by synthesizing the analogues and evaluating these three kinds of activity. Ca2+ antagonistic activity was largely determined by the lipophilicity of the phenyl group at the 2-position and the length of the alkyl chains. As for-the antioxidant activity, it was demonstrated that the phenolic hydroxyl group is an essential structural element. Compounds with potent activity were! evaluated for their effect on the coronary blood flow in vivo. Among these compounds, compound 1 was shown to be the most potent. Furthermore, the enantiomers of 1 were resolved by high-performance liquid chromatography with a chiral column. Compound (-)-1 showed about 10 times higher Ca2+ antagonistic activity than (+)-1, though both enarrtiomers had similar potency in Ca2+ overload inhibition and antioxidant activity. An X-ray crystal structure determination of (-)-1 hydrogen fumarate identified (-)-1 as having S configuration at the 2-position.
Novel Calcium Antagonists with Both Calcium Overload Inhibition and Antioxidant Activity. 2. Structure−Activity Relationships of Thiazolidinone Derivatives
摘要:
CP-060 (1), 2-(3,5-di-tert-butyl-4-hydroxyphenyl)-3-[3-[N-methyl-N-[2-[3,4-(methylenedioxy)phenoxy]ethyl]amino]propyl]-1,3-thiazolidin-4-one, is a novel type of Ca2+ antagonist possessing both Ca2+ overload inhibition and antioxidant activity. The structure-activity relationships for this series of compounds were studied by synthesizing the analogues and evaluating these three kinds of activity. Ca2+ antagonistic activity was largely determined by the lipophilicity of the phenyl group at the 2-position and the length of the alkyl chains. As for-the antioxidant activity, it was demonstrated that the phenolic hydroxyl group is an essential structural element. Compounds with potent activity were! evaluated for their effect on the coronary blood flow in vivo. Among these compounds, compound 1 was shown to be the most potent. Furthermore, the enantiomers of 1 were resolved by high-performance liquid chromatography with a chiral column. Compound (-)-1 showed about 10 times higher Ca2+ antagonistic activity than (+)-1, though both enarrtiomers had similar potency in Ca2+ overload inhibition and antioxidant activity. An X-ray crystal structure determination of (-)-1 hydrogen fumarate identified (-)-1 as having S configuration at the 2-position.
Compounds represented by formula (I):
wherein, for example, R₁, R₂, R₃, and R₄ each represents a hydrogen atom; R₆ and R₇ each represent a substituted or unsubstituted lower alkyl group; A represents a group represented by formula (II):
wherein R₅ represents, for example, a hydrogen atom; and n represents an integer of 2 to 6, or a possible stereoisomer or optical isomer thereof and a pharmaceutically acceptable salt thereof. The compounds represented by formula (I) have an inhibitory action on calcium overload in addition to a vasorelaxing activity (calcium antagonism) and an inhibitory action on lipid peroxidation and are useful as a preventive or treating agent for ischemic diseases and a hypertension.
A compound represented by general formula (I), possible stereoisomer and optical isomer thereof, and pharmaceutically acceptable salts thereof, wherein R1, R2, R3 and R4 represent each hydrogen, etc.; R6 and R7 represent each optionally substituted lower alkyl; A represents a group of general formula (II) (wherein R5 represents hydrogen, etc.); and n is an integer of from 2 to 6. These compounds can suppress the formation of active oxygen and an increase in intracellular calcium and thus are useful as a remedy for ischemic diseases.