Process for the preparation of novel benzopyrane derivatives

Claim 1

A 3-glycoloylamino-4-oxo-4H-1-benzopyrane derivative of the formula I' ##STR9## wherein R is lower alkanoyloxy methyl, benzoyloxy methyl, benzoyloxy methyl mono- or di-substituted by lower alkyl, lower alkoxy or halogen, lower alkoxy-methyl, lower alkoxy-methyl mono- or di-substituted by hydroxyl, lower alkoxy or di-lower alkylamino, phenyl-lower alkoxy-methyl, phenyl-lower alkoxy-methyl mono- or di-substituted by lower alkyl, lower alkoxy or halogen; Ph is 1,2-phenylene which is unsubstituted or mono-substituted in one of the free positions by lower alkyl having not more than 4 carbon atoms, lower alkoxy having not more than 4 carbon atoms, lower alkanoyl having not more than 7 carbon atoms, hydroxyl or halogen with an atomic number of not more than 35 or is disubstituted on two adjacent free positions by 3-membered or 4-membered lower alkylene having not more than 4 carbon atoms or 3-membered or 4-membered lower alkylenedioxy, and R 1 is hydrogen, lower alkyl having not more than 4 carbon atoms or phenyl, in the free form or in the form of a salt.