MEDICAMENTS, VICINAL DIHYDROXYALKYLXANTHINES CONTAINED THEREIN, PROCESS FOR THE PREPARATION OF THESE XANTHINE COMPOUNDS AND INTERMEDIATE PRODUCTS SUITABLE FOR THESE

摘要

The invention relates to the preparation of xanthine derivatives of the formula I (I) in which one of the radicals R1, R2 and R3 represents a group of the formula IV (IV) or IX (IX) R4 denoting hydrogen or methyl, R6 and R7, independently of one another, being hydrogen, lower alkyl, phenyl-alkyl having up to 2 C atoms in the alkyl moiety or phenyl and n, when R4 is hydrogen, denoting 2 to 6 and when R4 is methyl, denoting 1 to 5, the rest of the radicals R1, R2 and R3, independently of one another, denote hydrogen or alkyl having 1 to 12 C atoms in the positions R1 and R3 and having 1 to 4 C atoms in the position R2, and the total of carbon atoms in these two radicals, being a maximum of 14, and to processes for the preparation of these derivatives. These compounds are useful products of dihydroxyalkylxanthines useful in the treatment of obstructive respiratory tract diseases.