Intermediate-Dependent Unusual [4+3], [3+2] and Cascade Reactions of 3-Indolylmethanols: Controllable Chemodivergent and Stereoselective Synthesis of Diverse Indole Derivatives
作者:Hong-Hao Zhang、Zi-Qi Zhu、Tao Fan、Jing Liang、Feng Shi
DOI:10.1002/adsc.201501063
日期:2016.4.14
Chemodivergent and stereoselective construction of indole‐containing scaffolds, as well as synthesis of diverse indole derivatives, has long been a goal in the chemistry community. In this work, we reveal key intermediate‐dependent unusual [4+3], [3+2] and cascade reactions of 3‐indolylmethanols with Nazarov reagents, leading to controllable chemodivergent and stereoselective synthesis of diverse indole
含吲哚支架的化学发散和立体选择性构建以及多种吲哚衍生物的合成一直是化学界的目标。在这项工作中,我们揭示了3-吲哚基甲醇与Nazarov试剂的关键的依赖于中间体的异常[4 + 3],[3 + 2]和级联反应,从而导致可控的化学发散和立体选择性合成各种吲哚衍生物。(i)在乙腈中存在氢溴酸的情况下,3-吲哚基甲醇用Nazarov试剂进行电子逆转[4 + 3]环化,从而构建了环庚烷[ b] indole框架,并伴随以高度非对映选择性的方式创建带有四元立体中心的全碳七元环。(ii)在氟代苯中氢溴酸的促进下,使用Nazarov试剂对甲基保护的3-二吲哚甲醇进行了位点选择性[3 + 2]环化,从而建立了一个环戊(b)吲哚骨架,该骨架上带有一个螺四元立体中心。化学收率。(iii)通过改变酸的乙腈的三氟甲磺酸中,相同的反应物进行了级联反应通过产生多个新的C,得到相应的吲哚衍生物在(C键E / Z)-选择性