Divergent Strategy for the Diastereoselective Synthesis of the Tricyclic 6,7-Diaryltetrahydro-6<i>H</i>-benzo[<i>c</i>]chromene Core via Pt(IV)-Catalyzed Cycloaddition of <i>o</i>-Quinone Methides and Olefin Ring-Closing Metathesis
作者:Kassrin Tangdenpaisal、Kanokpish Chuayboonsong、Somsak Ruchirawat、Poonsakdi Ploypradith
DOI:10.1021/acs.joc.6b03086
日期:2017.3.3
A divergent strategy for the synthesis of the tricyclic 6,7-diaryltetrahydro-6H-benzo[c]chromene core was successfully developed. The 2,3-trans, 2,4-cis trisubstituted chroman moiety was formed via highly efficient and stereoselective Pt(IV)-catalyzed cycloaddition reactions of the corresponding quinone methides with chalcones. Subsequent steps provided the common diene alcohol, which underwent BF3·Et2O-mediated
成功开发了一种合成三环6,7-二芳基四氢-6 H-苯并[ c ]色烯核心的不同策略。2,3-反式,2,4-顺式三取代的苯并二氢吡喃部分是通过相应的醌甲基化物与查耳酮的高效且立体选择性的Pt(IV)催化的环加成反应形成的。随后的步骤提供了普通的二烯醇,其经过BF 3 ·Et 2 O介导的Et 3 SiH还原和使用Ru(II)催化剂进行的烯烃闭环复分解(RCM)。最后两个步骤的顺序为使C6和C10a处的立体化学结果多样化提供了一种方法。