Orally active GPIIb/IIIa antagonists: synthesis and biological activities of masked amidines as prodrugs of 2-[(3S)-4.
To improve the in vivo potency of the potent GPIIb/IIIa antagonist 2-[(3S)-4-[(2S)-2-(4-amidinobenzoylamino)-3-(4-methoxyphenyl)propanoyl]-3-(2-methoxy-2-oxoethyl)-2-oxopiperazinyljacetic acid (4), the amidino group was converted to an oxadiazole ring, thiadiazole ring or substituted amidoxime group. These groups were expected to be metabolized to an amidino group in vivo. The compounds synthesized were evaluated for their potency to inhibit the ex vivo adenosine 5'-diphosphate (ADP)-induced aggregation of guinea pig platelets. Among the compounds examined, the methoxycarbonyloxyamidine 8a exhibited the most potent ex vivo inhibitory activity with a fast onset and prolonged duration of action after oral administration.
Kitamura
S
S
Medicinal Chemistry Research Laboratories, Takeda Chemical Industries, Ltd., Osaka, Japan. Kitamura_Shuji@takeda.co.jp
Fukushi
I
I
Miyawaki
T
T
Kawamura
M
M
Terashita
E
E
Naka
T
T
D000085:Acetates / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology*; D000596:Amino Acids / Q000737:chemistry; D000818:Animals; D001665:Binding Sites; D006168:Guinea Pigs; D066298:In Vitro Techniques; D007202:Indicators and Reagents; D008297:Male; D008968:Molecular Conformation; D010879:Piperazines / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology*; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000138:chemical synthesis* / Q000493:pharmacokinetics / Q000494:pharmacology*; D019039:Platelet Glycoprotein GPIIb-IIIa Complex / Q000037:antagonists & inhibitors*; D011355:Prodrugs / Q000138:chemical synthesis* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
C430783:2-((3)-4-(2)-2-(4-amidinobenzoylamino)-3-(4-methoxyphenyl)propanoyl)-3-(2-methoxy-2-oxoethyl)-2-oxopiperazinyljacetic acid; D000085:Acetates; D000596:Amino Acids; D007202:Indicators and Reagents; D010879:Piperazines; D010975:Platelet Aggregation Inhibitors; D019039:Platelet Glycoprotein GPIIb-IIIa Complex; D011355:Prodrugs