Novel 3-formylchromone derivatives are disclosed, substituted on the 5,6,7, or 8 positions by one or more of the following substituents: halogen, hydroxy, lower alkyl, lower alkoxy, lower acyl, lower acyloxy, or methylenedioxy. The corresponding 3-acetal or 3-hydrazone derivatives of the carboxaldehyde group are also disclosed. These compounds, and pharmaceutical compositions containing these compounds are useful for the treatment of allergic conditions and for the treatment of hyperacidity.
Novel 3-formylchromone derivatives are disclosed, substituted on the 5,6,7, or 8 positions by one or more of the following substituents: halogen, hydroxy, lower alkyl, lower alkoxy, lower acyl, lower acyloxy, or methylenedioxy. The corresponding 3-acetal or 3-hydrazone derivatives of the carboxaldehyde group are also disclosed. These compoounds, and pharmaceutical compositions containing these compounds are useful for the treatment of allergic conditions and for the treatment of hyperacidity.
An Easy Conversion of 2<i>H</i>-Chromenes into Coumarins. An Entry to 3-Formyl Coumarins
作者:Loïc Rene、Alain Lefebvre、Gilles Auzou
DOI:10.1055/s-1986-31707
日期:——
3-Formyl coumarins 4 are easily prepared by conversion of 3-cyano-2-morpholino-2H-chromenes 1 in boiling aqueous hydrochloric acid.This transformation occurs in two steps from salicylaldehydes.