Structure−Activity Relationships of a Novel Class of Endothelin-A Receptor Antagonists and Discovery of Potent and Selective Receptor Antagonist, 2-(Benzo[1,3]dioxol-5-yl)-6-isopropyloxy-4-(4-methoxyphenyl)-2H-chromene-3- carboxylic Acid (S-1255). 1. Study on Structure−Activity Relationships and Basic Structure Crucial for ETA Antagonism
摘要:
A novel series of endothelin-A (ETA) selective receptor antagonists having a 2H-chromene skeleton are described. A lead compound, 2-(benzo[1,3]dioxol-5-yl)-2H-chromene-3-carboxylic acid (3), was found by modifications of our own angiotensin II antagonist. A structure-activity relationship (SAR) study of 3 reveals that the structural requirements essential for potent and selective ETA receptor binding affinity are the m,p-methylenedioxyphenyl, carboxyl, and isopropoxy groups at the 2-, 3-, and 6-positions, respectively, on the (R)-2H-chromene skeleton. The substituent at the 4-position is also important for improving the activity, and various hydrophobic functional groups of 6-9 Angstrom such as liner, branched, and cyclic aliphatic groups, unsubstituted and substituted aryl groups, and even halogen atoms were acceptable. These results suggest that (R)-2-(benzo[1,3]dioxol-5-yl)-6-isopropoxy-2H-chromene-3-carboxylic acid, formula 108, is the crucial basic structure to be recognized by the ETA receptor. The most potent compound is (R)-48 (S-1255), which binds to the ETA receptor with an IC50 value of 0.19 nM and is 630-fold selective for the ETA receptor than for the ETB receptor. This compound has 55% oral bioavailability in rats. On the basis of the SAR, the roles of each substituent in the receptor binding are discussed.
The present invention relates to a process for preparing betamimetics of formula 1,
wherein n denotes 1 or 2;
R
1
denotes hydrogen, halogen, C
1-4
-alkyl or O—C
1-4
-alkyl;
R
2
denotes hydrogen, halogen, C
1-4
-alkyl or O—C
1-4
-alkyl;
R
3
denotes hydrogen, C
1-4
-alkyl, OH, halogen, O—C
1-4
-alkyl, O—C
1-4
-alkylene-COOH, O—C
1-4
-alkylene-COO—C
1-4
-alkyl.
o-hydroxyacetophenones with 2 equivalents of arylaldehydes provides 2-aryl-3-(arylmethyl)chromones (a chimera of flavone and homoisoflavanone) in MeOH at 50 °C under mild conditions. The uses of various bases and solvents are investigated for one-pot facile and efficient transformation. A plausible mechanism is proposed.
[EN] BIPHENYL DERIVATIVE HAVING BETA2 RECEPTOR EXCITEMENT AND M RECEPTOR ANTAGONISTIC ACTIVITIES AND APPLICATION THEREFOF IN MEDICAMENT<br/>[FR] DÉRIVÉ BIPHÉNYLE PRÉSENTANT DES ACTIVITÉS D'EXCITATION DE RÉCEPTEUR BÊTA2 ET DES ACTIVITÉS ANTAGONISTES AU RÉCEPTEUR M ET SON APPLICATION DANS UN MÉDICAMENT<br/>[ZH] 具有β2受体激动及M受体拮抗活性的联苯衍生物及其在医药上的用途
A novel series of 3,4-dihydroxychalcones was synthesized to evaluate their effects against 5-lipoxygenase and cyclooxygenase. Almost all compounds exhibited potent inhibitory effects on 5-lipoxygenase with antioxidative effects, and some also inhibited cyclooxygenase. The 2',5'-disubstituted 3,4-dihydroxychalcones with hydroxy or alkoxy groups exhibited optimal inhibition of cyclooxygenase. We found that 2',5'-dimethoxy-3,4-dihydroxychalcone (37; HX-0836) inhibited cyclooxygenase to the same degree as flufenamic acid and 6-lipoxygenase, more than quercetin. Finally, these active inhibitors of 5-lipoxygenase inhibited arachidonic acid-induced mouse ear edema more than phenidone.