Copper(II)-Promoted Cyclization/Difunctionalization of Allenols and Allenylsulfonamides: Synthesis of Heterocycle-Functionalized Vinyl Carboxylate Esters
摘要:
A unique method to affect intramolecular aminooxygenation and dioxygenation of allenols and allenylsulfonamides is described. These operationally simple reactions occur under neutral or basic conditions where copper(II) carboxylates serve as reaction promoter, oxidant, and carboxylate source. Moderate to high yields of heterocycle-functionalized vinyl carboxylate esters are formed with moderate to high levels of diastereoselectivity. Such vinyl carboxylate esters could serve as precursors to alpha-amino and alpha-oxy ketones and derivatives thereof.
4,5-dipheny-oxazole derivatives and their use as platelet aggregation inhibitors
申请人:FUJISAWA PHARMACEUTICAL CO., LTD.
公开号:EP1213285A3
公开(公告)日:2002-07-03
Heterocyclic compounds of the formula: whereinR1 is carboxy or esterified carboxy,R2 and R3 are phenyl or (C1-C6)alkylphenyl,A1 is (C1-C6)alkylene, andn is 0 or 1, for the treatment or prevention of arterial obstruction, hepatitis, hepatic insufficiency, restenosis after percutaneous transluminal coronary angioplasty, arteriosclerosis, cerebrovascular disease or ischemic heart disease.
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.