1-Azaxanthone-3-carboxylic acids and their production

Details 1-Azaxanthone-3-carboxylic acids and their production 1-Azaxanthone-3-carboxylic acids and their production

1980-09-10

1981-11-24

Ford, John M.

Drug, bio-affecting and body treating compositions

Antigen, epitope, or other immunospecific immunoeffector

Bacterium or component thereof or substance produced by said...

546 89, A61K 3144, C07D 4952

Patent

active

043024637

ABSTRACT:
Novel 1-azaxanthone-3-carboxylic acid derivatives, which are shown by the following formula (I) ##STR1## wherein R is hydrogen, alkyl, alkoxy or halogen; R.sub.1 and R.sub.2 are the same or different and each is hydrogen, alkyl or alkenyl; and m is 1 or 2; and their physiologically acceptable salts, are usable as effective medicines for preventing and/or treating allergic diseases. The compound of the formula (I) can be produced by reacting a compound of the formula: ##STR2## wherein R and m have the same meaning as defined above; R.sub.3 is carboxyl or group which is convertible into carboxyl through hydrolysis; X is alkyl phosphate radical or halogen, with a compound of the formula: ##STR3## wherein R.sub.1 and R.sub.2 have the same meaning as defined above, or its salt, and conducting hydrolysis, if necessary.

REFERENCES:
patent: 4143042 (1979-03-01), Nohara et al.
Petersen; H. et al., "Herstellung and Reaktionen Von 2-Amino-4-oxo-4H-chromen-3-carbaldehyd", Liebigs Ann. Chem. 1976:1659.

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