Acetone → Flavanone

Participants

Reaction Steps

(+)-4H-2-carboxamido-4-phenyl-thieno[3,2-c][1]benzopyran, [α]43625 =+110° (c=0.5, acetone), is prepared according to example 30 in the same manner as the corresponding racemate, but starting from the pure enantiometric 4-chloro-3-formyl-flav-3-ene which is obtained by chloroformylation of (+)-flavanone [(+) at 436 nm] according to EP-A-139615.

Provenance & Evidence