Claims
- 1. A xanthine of the formula I ##STR98## wherein R.sub.1 is a C.sub.1 -C.sub.4 alkyl group;
- R.sub.2 is a C.sub.1 -C.sub.4 alkyl group;
- R.sub.3 tetrahydropyran-4-yl or 1,3-dithiolan or;
- R.sub.3 represents one of the groups of formula ##STR99## or a pharmaceutically acceptable acid addition salt thereof.
- 2. A xanthine of the formula I wherein
- R.sub.1 represents an unbranched C.sub.3 alkyl group;
- R.sub.2 represents an unbranched C.sub.3 alkyl group, and
- R.sub.3 represents norbornanyl or norbornenyl.
Priority Claims (1)
Number |
Date |
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Kind |
38 43 117.3 |
Dec 1988 |
DEX |
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Parent Case Info
This is a continuation, of application Ser. No. 942,871, filed Sep. 10, 1992, now abandoned which is a division of application Ser. No. 691,193, filed Apr. 25, 1991, now U.S. Pat. No. 5,175,291, which is a continuation of application Ser. No. 452,643, filed Dec. 18, 1989, now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3624215 |
Stein et al. |
Nov 1971 |
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3624216 |
Stein et al. |
Nov 1971 |
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4755517 |
Brun et al. |
Jul 1988 |
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5175290 |
Rzeszotarski et al. |
Dec 1992 |
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Foreign Referenced Citations (1)
Number |
Date |
Country |
1201997 |
Jul 1968 |
ILX |
Non-Patent Literature Citations (5)
Entry |
Chemical Abstracts, 109., No. 122899q. |
Chemical Abstracts, 108, No. 94512s. |
Chemical Abstracts, 107, No. 259u. |
Chemical Abstracts, 106, No. 149315w. |
Chemical Abstracts, 88, No. 152567. |
Divisions (1)
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Number |
Date |
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Parent |
691193 |
Apr 1991 |
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Continuations (2)
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Number |
Date |
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Parent |
942871 |
Sep 1992 |
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Parent |
452643 |
Dec 1989 |
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