摘要:
The reaction of nitrosubstituted aryl fluorides 1 with cyclic beta-diketones 2 proceeds at 20 - 80-degrees-C in the presence of bases, such as KOH, KF or NaOEt, leading to the aryl ethers 3 a - m. Depending on the base the reaction of dimedone 2a or 1,3-cyclohexanedione 2b with 2,4-dinitrofluorobenzene 1 a or 4-fluoro-3-nitrobenzonitrile 1 b furnishes C- and/or O-arylated products. Upon heating of 3 g, e and 3 m at 40 - 100-degrees-C in DMF/K2CO3, the C-arylated ketones 4 a - c are formed in good yields. Starting from 3 a we obtained the chromenedione 5 under the same conditions.