期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2010, 期 7, 页码 1339-1344出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200901356
关键词
Direct arylation; Palladium; C-C coupling; Chromanones; Synthetic methods; Isonavanones
For the first time, the synthesis of racemic isoflavanones has been achieved in satisfactory to good yields and with high selectivity by Pd-catalyzed direct C-3 arylation of 3-unsubstituted 4-chromanones with aryl bromides with the aid of a Pd-2(dba)(3)/tBu(3)PHBF(4) catalyst system in the presence of KHCO3 as the base in a dioxane/water mixture (4:1). This catalyst system has also been employed in an unprecedented synthesis of 3,3-diaryl-4-chromanones through direct arylation of 4-chromanones in water.
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