ChemInform Abstract: A NOVEL SYNTHESIS OF 3‐CHLOROFLAVONES

Abstract

Die o‐Hydroxydibenzoylmethane (I) reagieren mit Sulfurylchlorid zu den 3‐Chlorflavonen (II), die bei Behandlung mit ethanolischem KOH die entsprechenden 2‐Benzoylcumaranone (III) bilden.

Synthesis of 3-Bromo Derivatives of Flavones

“…Recently, Kirschning 16,17 reported that a combination of Et 4 NBr and PhI(OAc) 2 was used in a bromoacetoxylation of olefin. [18][19][20][21][22][23][24] As an alternative of molecular bromine, R 4 NBr/PhI(OAc) 2 system is a good bromination source for flavone. As a flavone has a a,b-unsaturated ketone moiety, it was interested to make its 3-bromo derivatives.…”