1.
J Org Chem
; 70(7): 2855-8, 2005 Apr 01.
Artigo
em Inglês
| MEDLINE
| ID: mdl-15787587
RESUMO
[reaction: see text] Eco-friendly direct solvent-free synthesis of flavones is achieved by microwave irradiation of phloroglucinol and beta-ketoesters. Heating with microwaves versus under classical conditions was shown to be higher yielding, cleaner, and faster. The reaction goes through a cycloaddition of an alpha-oxo ketene intermediate followed by an uncatalyzed thermal Fries rearrangement.