Diastereoselective pot-and atom-economical synthesis of densely-substituted polycyclic 1,2- and 1,2,3-fused indole scaffolds
作者:Soumen Biswas、Anubha Yadav、Debashis Majee、Shaikh M. Mobin、Sampak Samanta
DOI:10.1016/j.tetlet.2019.07.012
日期:2019.8
highly diastereoselective (up to ≤9:1 dr) construction of a series of pharmacologically attractive 1,2,3-fused tetracyclic indole scaffolds with five contiguous chiral centers including an all-carbon stereogenic center has been realized through our developed method. Moreover, pyrrolidine-BzOH and PTSA as combined catalytic systems promote the uninterrupted sequential Michael-cyclization reaction, followed
在温和的条件下,已经建立了一种简单,高效,一锅法的顺序步骤,以可接受的产率制备8,9-二氢吡啶并[1,2 - a ]吲哚-6(7H)-one支架家族。使用吡咯烷-BzOH作为有效的有机催化剂,在甲基丙烯酸2-(3-甲酰基-1 H-吲哚-2-基)乙酸甲酯和反式-β-芳基/烷基取代的丙烯醛之间进行迈克尔-半胺氧化反应原位生成的C,N室温下在PDC存在下与人为融合的血红素加合物。令人兴奋的是,通过我们的研究已经实现了有机碱催化的高度非对映选择性(高达≤9:1 dr)的结构,该结构具有一系列具有5个连续的手性中心(包括全碳立体中心)的具有药理吸引力的1,2,3-稠合四环吲哚骨架。发达的方法。此外,吡咯烷-BzOH和PTSA作为组合催化体系可促进不间断的顺序Michael-环化反应,然后与咔唑进行N-烷基化反应,生成有趣的6-(9 H-咔唑-9-基)-6,7, 8,9-四氢吡啶并[1,2- a ]吲哚衍生物的非对映选择性。