5-Oxo-5H-(1)benzopyrano(2,3-b)pyridine derivatives, their production and use as anti-inflammatory agents

A process for producing a compound of the formula:

• ##STR7## where R is the same or different and represents hydrogen, C.sup.1-6 -alkyl, C.sup.1-4 -alkoxy, nitro, hydroxyl, C.sup.1-3 -alkyl-CO, C.sup.1-4 -hydroxyalkyl or halogen where m is 1,2 or 3, or a --(CH.sub.2).sub.4 -- or --CH.dbd.CH--CH.dbd.CH-- group which, in conjunction with two adjacent carbon atoms on the ring, forms a six-membered ring where m is 1;
• and wherein n is 1 or 2, or a physiologically acceptable salt or ester thereof, which comprises reacting a compound of the formula:
• ##STR8## wherein R and m have the same meaning as defined above, with a compound of the formula:
• R.sub.1 OOC--(CH.sub.2).sub.n --COCH.sub.2 COOR.sub.1
• wherein R.sub.1 is alkyl and n has the same meaning as defined above, followed by subjecting the resultant reaction product to a hydrolysis reaction, if necessary.