A compound of the formula (I) ##STR1## in which: R.sub.1 represents a hydrogen atom, a lower alkyl group, a hydroxy group or a lower alkoxy group, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8 and R.sub.11 are as defined in the description. Medicaments.
New Route to Styrylchromones via [1-(2-Hydroxybenzoyl)alkylidene]triphenylphosphoranes
作者:F. Zammattio、J. D. Brion、P. Ducrey、G. Le Baut
DOI:10.1055/s-1992-26115
日期:——
Several [1-(2-hydroxybenzoyl)alkylidene]triphenylphosphoranes have been obtained in good yields through acylation of the corresponding alkylidenetriphenylphosphoranes, prepared in situ, by the easily available methyl 2-hydroxybenzoates. These ylides proved to be good starting materials for the synthesis of the corresponding 2-styrylchromones (2-styryl-4H-1-benzopyran-4-ones).