Discovery of new diphenyloxazole derivatives containing a pyrrolidine ring: Orally active prostacyclin mimetics. Part 2
摘要:
Synthetic and biological evaluation of novel diphenyloxazole derivatives containing a pyrrolidine ring, as a prostacyclin mimetic without the PG skeleton, are described. Asymmetric reduction of a ketone using a chiral Ru complex and reductive amination by NaBH4 produces four isomers of the tetrahydronaphthalene ring and the pyrrolidine ring with high stereoselectivity. FR193262 (4), (R,R)-diphenyloxazolyl pyrrolidine derivative, displays high potency and agonist efficacy at the IP receptor and has good bioavailability in rats and dogs. (c) 2005 Elsevier Ltd. All rights reserved.
Heterocyclic compounds of the formula:
wherein
R1 is carboxy or protected carboxy,
R2 is aryl which may have suitable substituent(s),
R3 is aryl which may have suitable substituent(s),
R4 is hydrogen, lower alkyl, hydroxy or aryl,
A1 is lower alkylene,
etc.,
etc. and
n is 0 or 1,
and pharmaceutically acceptable salts thereof which are useful as a medicament.
This invention relates to new heterocyclic compounds, compositions, process of making and method of use thereof for inhibition of platelet aggregation, vasodilation, antihypertensive activity and prostaglandin I.sub.2 agonist.