US Patent 7763631 Prodrugs of HIV replication inhibiting pyrimidines

The present invention concerns compounds of formula (A1)(A2)N—R1 (I), the N-oxide forms, the pharmaceutically acceptable addition salts, the quaternary amines and stereochemically isomeric forms thereof, wherein R1 is substituted C1-6alkyl; —S(═O)—R8; —S(═O)2—R8; C7-12alkylcarbonyl; optionally substituted C1-6alkyloxycarbonylC1-6alkylcarbonyl; with R8 being C1-6alkyl, aryl1 or Het1; (A1)(A2)N— is the covalently bonded form of the corresponding intermediate of formula (A1)(A2)N—H, which is a HIV replication inhibiting pyrimidine of formula