C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/242.4
C07D 473/00 (2006.01) C07C 29/10 (2006.01) C07C 31/42 (2006.01) C07D 303/08 (2006.01) C07D 317/16 (2006.01) C07D 317/20 (2006.01) C07D 473/06 (2006.01) C07D 473/08 (2006.01)
Patent
CA 1263387
ABSTRACT OF THE DISCLOSURE The invention relates to the preparation of xanthine derivatives of the formula I Image (I) in which one of the radicals R1, R2 and R3 represents a group of the formula IV Image (IV) or IX Image (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.
529856
Anagnostopulos Hiristo
Furrer Harald
Gebert Ulrich
Hinze Heinz-Joachim
Anagnostopulos Hiristo
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Furrer Harald
Gebert Ulrich
Hinze Heinz-Joachim
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