申请人:Warner-Lambert Company
公开号:US04066655A1
公开(公告)日:1978-01-03
The present invention relates to 4,10-dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carboxylic acids, salts and esters having the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, halogen, hydroxy or lower alkoxy; R.sub.2 is hydrogen, aralkyl or lower alkyl; R.sub.3 is hydrogen or lower alkyl and their pharmaceutically acceptable salts. These compounds are indicated in the management of allergic conditions such as bronchial asthma, hay fever and the like.
本发明涉及具有以下结构式的4,10-二氢-4,10-二氧-1H-1-苯并吡喃[3,2-b]吡啶-3-羧酸、盐和酯:其中R.sub.1是氢、低碳基、卤素、羟基或低烷氧基;R.sub.2是氢、芳基烷基或低碳基;R.sub.3是氢或低碳基,以及它们的药用可接受盐。这些化合物适用于治疗过敏性疾病,如支气管哮喘、花粉热等。