Synthetic approach to flavanones and flavones via ligand-free palladium(ii)-catalyzed conjugate addition of arylboronic acids to chromones
作者:Donghee Kim、Kyungrok Ham、Sungwoo Hong
DOI:10.1039/c2ob26061a
日期:——
The remarkable catalytic effects of Fe(OTf)3 in the context of the Pd(II)-catalyzed conjugate addition of arylboronic acids to chromones were observed to yield a variety of flavanones under mild conditions. The addition of catalytic amounts of DDQ and KNO2 to the reactions exclusively yielded flavone analogs. The reaction scope for the transformation was fairly broad, affording good yields of a wide range of flavanones and flavones, which are privileged structures in many biologically active compounds.
The catalytic Baeyer–Villiger rearrangement of flavanones is described by the use of the homogeneous methyltrioxorhenium (MTO)/H2O2 system. In these experimental conditions 3,4-dihydro-4-phenyl-1,5-benzodioxepin-2-ones and previously not reported para-quinone derivatives have been obtained in mild experimental conditions from acceptable to good yields.
黄烷酮的催化拜耶-维利格重排反应是通过使用均相甲基三氧杂hen(MTO)/ H 2 O 2系统进行描述的。在这些实验条件下,已在温和的实验条件下从可接受的产率到良好的产率获得了3,4-二氢-4-苯基-1,5-苯并二氧杂-2-酮和先前未报道的对苯醌衍生物。
Flavonoid Compounds and Uses Thereof
申请人:Jarrott Bevyn
公开号:US20090130051A1
公开(公告)日:2009-05-21
Novel flavonoid compounds having anti-oxidant activity are described. The compounds and compositions have been shown to exhibit anti-oxidant properties and are particularly useful in the treatment of ischemia and reperfusion injuries. The invention also describes a method to chemically synthesize such flavonoid compounds and test their efficacy. Such compounds and corresponding pharmaceutically acceptable derivatives and/or salts have uses in the areas of pharmaceuticals, nutraceutical, and veterinary applications.