2-Hydroxyoxanilic acid derivatives and salts, their preparation and pharmaceutical compositions containing them
申请人:YAMANOUCHI PHARMACEUTICAL CO. LTD.
公开号:EP0030436A1
公开(公告)日:1981-06-17
2-hydroxyoxanilic acid derivatives shown by the following formula
and salts thereof possess an immunoregulatory action and can be useful as antiallergic agents, antiasthmatics, antirheumatics, carcinostatic agents, therapeutic agents for autoimmune disease, and suppressants of rejection in tissue transplants and skin grafts. They can be made from the corresponding aminophenols and oxalylic acids.
New benzoxazinone type dyes have been synthesized by the reaction of α-keto esters on 2-amino-5-(dialkylamino)phenols. The obtained 7-dialkylamino-2H-1,4-benzoxazin-2-ones show a strong fluorescence and a large Stokes shift, reaching 183 nm. An effect of 15 various substituents in position 3, together with a solvent effect have been characterized on their absorption and emission bands. Linear free energy relationships allow the tuning of their spectroscopic characteristics over a large spectral range.