Substituted pyrimidine compounds and the use thereof

A pyrimidine compound of formula I

• wherein
• A is C2-C15-alkylene which is interrupted by, or which is bonded to the pyrimidine ring through, a radical NR4,
• B is
• R1, R2, R3 are, independently of one another, H, halogen, OR4, NR4R5, SR4 CF3, CN, CO2R4 or C1-C8-alkyl which is unsubstituted or substituted by OH, OC1-C8-alkyl or halogen,
• R4 is H, C1-C8-alkyl which is unsubstituted or substituted by OH, OC1-C8-alkyl or halogen,
• R5 has the meanings indicated for R4 or is COR4 or CO2R4,
• Ar is pyridyl, pyrimidyl, triazinyl, naphthyl or quinolinyl, where Ar may carry from one to four substituents selected from the group consisting of OR5, C1-C8-alkyl, C2-C6-alkenyl, C2-C6-alkynyl, halogen, CN, CO2R4, NO2, SO2R4, SO3R4, NR4R5, SO2NR4R5, SR4, CF3, CHF2, pyrrolyl and pyrrolidinyl,
• or a salt thereof with a physiologically tolerated acid.