申请人:Takeda Chemical Industries, Ltd.
公开号:US04716167A1
公开(公告)日:1987-12-29
The present invention relates to novel 2-amino-5-oxo-5H-[1]benzopyrano[2,3-b]pyridine-3-carboxylic acid derivatives useful for prophylaxis and therapy of allergic diseases such as allergic asthma, allergic dermatitis and hay fever, which have the following formula: ##STR1## wherein A is ##STR2## (R, R.sup.1 and R.sup.2 are independently hydrogen or lower alkyl and m is 0 or 1, with the proviso that when m is 1, R.sup.1 is hydrogen) or R--Co-- (R has the same meaning as defined above), or a physiologically acceptable salt thereof, and to a method for preparing the same.
本发明涉及一种新型2-氨基-5-氧代-5H-[1]苯并吡喃[2,3-b]吡啶-3-羧酸衍生物,用于预防和治疗过敏性疾病,如过敏性哮喘、过敏性皮炎和花粉症,其化学式如下:##STR1## 其中A是##STR2##(其中R、R.sup.1和R.sup.2独立地表示氢或低碳基,m为0或1,但当m为1时,R.sup.1为氢)或R--Co--(其中R的含义与上述定义相同),或其生理上可接受的盐,并提供一种制备方法。