A Flexible and Divergent Strategy to Flavonoids with a Chiral A-Ring Featuring Intramolecular Michael Addition: Stereoselective Synthesis of (+)-Cryptocaryone, (+)-Cryptogione F, and (+)-Cryptocaryanones A and B, as Well as (+)-Cryptochinones A and C
作者:Xiaojing Liu、Junhao Jia、Yuanliang Jia、He Gu、Jingwen Luo、Xiaochuan Chen
DOI:10.1021/acs.orglett.8b00479
日期:2018.4.6
cyclization via a highly stereoselective intramolecular Michael addition of 1,3-diketone proceed under mild conditions; thus, the chiral flavonoids bearing C-7 oxy functional groups or olefinic bonds are both easily accessible. Using this approach, the first synthesis of (+)-cryptogione F, (+)-cryptocaryanone B, and (+)-cryptochinones A and C, as well as stereoselective synthesis of (+)-cryptocaryone and
已经开发了一种灵活的策略来合成带有手性A环的发散性黄酮。作为两个关键步骤,在温和的条件下进行通过硼介导的羟醛缩合的偶联和通过高度立体选择性的分子内迈克尔加成1,3-二酮的环化反应。因此,带有C-7氧官能团或烯键的手性类黄酮均易于获得。使用这种方法,首先合成(+)-隐球菌酮F,(+)-隐球菌酮B和(+)-隐球菌酮A和C,以及(+)-隐球菌酮和(+)-隐球菌酮A的立体选择性合成。中,从2-脱氧实现d在高的总产率-核糖。