Cyanoacetic acid → Hydroxyindene-3-acetic acid

Beteiligte Stoffe

Reaktionsschritte

In an alternative preparation scheme, the intermediate hydroxyindanone can be reacted with cyanoacetic acid to give the corresponding hydroxyindene-3-acetic acid, which is then esterified before introduction of the R5 -methylene grouping in order to facilitate the purification of desired intermediates. Since introduction of the R5 -methylene grouping is accompanied by ester hydrolysis, the intermediate free acid is re-esterified to facilitate purification followed by reaction with an appropriate haloalkyl-A group to yield the desired final product ##STR20## can be prepared by reacting a halo-indene-3-acetic acid with a A(CH2)n -containing benzaldehyde prepared from the corresponding individual components ##STR21##

Herkunft & Nachweise