Preparation of 2-amino-7-(1-substituted-2-hydroxyethyl)-3,
申请人:Novartis AG
公开号:US06043365A1
公开(公告)日:2000-03-28
The compounds of formula I ##STR1## wherein Ar represents biaryl, carbocyclic or heterocyclic aryl, are prepared, as substantially pure enantiomers, by (a) condensing a compound of the formula ##STR2## as a substantially pure enantiomer, wherein Ar has meaning as defined above and R.sub.6 is on O-protecting group with a lower alkyl ester of formic acid; (b) then condensing the compound so obtained with a compound of the formula ##STR3## wherein R.sub.8 is hydrogen or COOR.sub.3 and R.sub.3 is lower alkyl; (c) then cyclizing the compound so obtained to a compound of the formula ##STR4## as a substantially pure enantiomer; (d) and then condensing the compound so obtained (1) with a carbocyclic aroyl isothiocyanate and treatment of the product so obtained with an alkyl halide followed by anhydrous ammonia; or (2) with cyanamide in acid, optionally followed by treatment with a base.
The invention relates to the 2-amino-7-(1-substituted-2-hydroxyethyl)-3, 5-dihydro-pyrrolo[3,2-d] pyrimidin-4-ones of formula I
and tautomers thereof, wherein Ar represents biaryl, carbocyclic or heterocyclic aryl; pharmaceutically acceptable prodrug ester derivatives; and pharmaceutically acceptable salts thereof, which are particularly useful as potent purine nucleoside phosphorylase (PNP) inhibitors.