Optimized Palladium(0)-catalyzed Suzuki Cross-coupling Reaction of Polystyrene-supported Selenenyl Flavanones: A Convenient Preparation of Biaryl-chromen-4-one
作者:E Tang、Wen Li、Zhangyong Gao、Lianpeng Zhang、Qiushi Ma
DOI:10.1002/cjoc.201280023
日期:2012.3
Application of the Suzuki cross‐couplingreaction for efficient synthesis of diverse substituted biaryl‐chromen‐4‐ones using an optimized palladium(0) catalyst system is reported. The coupling of arylboronic acids with the resin‐bound bromoflavanones which were prepared by organoselenium‐induced regioselective intramolecular cyclization of bromo‐2‐hydroxylchalcones proceeded smoothly. Biaryl‐chromen‐4‐ones
3-Acetylbiphenyl-4-ol and -2-ol were condensed with substituted benzaldehydes to give respectively 5′-and 3′-phenyl-substituted chalcones (1a–k), which were cyclized to afford 6- and 8-phenylflavanones. The chalcones (1a–k) also gave the corresponding 6- and 8-phenylflavones via dibromides. The effects of the phenyl group on the spectral data are also discussed.