| abstract |
Procedure for obtaining benzopyran derivatives, with the general formula: **(Formula)** where R means hydroxymethyl, if necessary esterified with a carboxylic acid, Ph means 1,2-phenylene containing the group R-CO-NR3- , optionally substituted, X denotes a group of the formula -CO-CR1=CR2-, where R1 and R2, independently of one another, signify hydrogen, acyl or a hydrocarbon radical, optionally substituted or optionally heteroanalogous, or together signify alkylene 3- to 5-membered lower alkyl and R 2 may be hydroxy, optionally etherified or esterified with an organic carboxylic acid and R 3 denotes hydrogen or lower alkyl, in free form or in salt form. |