Process for the preparation of flavone derivatives

Details Process for the preparation of flavone derivatives Process for the preparation of flavone derivatives

2006-03-07

2006-03-07

Solola, Taofiq (Department: 1626)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07009062

ABSTRACT:
The invention relates to a process for the preparation of flavone derivatives in which a 2-hydroxyacetophenone compound is metallated using a lithium compound at low temperatures and subsequently reacted with a keto compound, and where the ratio of the molar equivalents of lithium compound to the 2-hydroxyacetophenone compound functional groups to be metallated is from 1 to 1.2. The resultant β-diketone compound is subsequently cyclized with warming in an acidic medium.

REFERENCES:
patent: 5889003 (1999-03-01), Dhainaut et al.
patent: 0832886 (1998-04-01), None
D. Nagarathnam: “A Short and Facile Synthetic Route to Hydroxylated Flavones.” Journal of Organic Chemistry., Bd.56, 1991, Seiten 4887-7.

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