This invention relates to substituted 2-amino chromones of the general structure I: ##SPC1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 may be hydrogen, hydroxy, lower alkyl or lower alkoxy of 1-6 carbon atoms, halogen such as chloro or bromo, or aryl such as phenyl, and X may be cyano or carboxamido. Two novel procedures for preparing substituted 2-amino chromones having the Formula I, starting with salicylic acid or substituted salicylic acid, are described. The compounds of this invention are active in the prevention of allergic and asthmatic reactions in mammals.
本发明涉及一般结构I的取代2-
氨基
香豆素:##
SPC1## 其中R.sub.1、R.sub.2、R.sub.3和R.sub.4可以是氢、羟基、1-6个碳原子的低烷基或低烷氧基、
氯或
溴等卤素或苯基,X可以是
氰基或羧酰胺基。本文描述了两种用
水杨酸或取代
水杨酸为起始物制备具有式I的取代2-
氨基
香豆素的新方法。本发明化合物在预防哺乳动物过敏和哮喘反应方面具有活性。