Synthesis of Benzo[<i>a</i>]carbazoles and an Indolo[2,3-<i>a</i>]carbazole from 3-Aryltetramic Acids
作者:Nathanyal J. Truax、Fernando Banales Mejia、Deborah O. Kwansare、Megan M. Lafferty、Maeve H. Kean、Erin T. Pelkey
DOI:10.1021/acs.joc.6b01072
日期:2016.8.5
3-pyrrolin-2-one fused carbazoles is disclosed. The key step involves the BF3-mediated electrophilic substitution of indoles with N-alkyl-substituted 3-aryltetramic acids, which provides access to indole-substituted 3-pyrrolin-2-ones. Scholl-type oxidative cyclizations of these materials led to the formation of the corresponding 3-pyrrolin-2-one-fused benzo[a]carbazoles and indolo[2,3-a]carbazoles. This work represents
公开了一种简单且灵活的3-吡咯啉-2-酮稠合咔唑的方法。关键步骤涉及用N-烷基取代的3-芳基四甲酸进行吲哚的BF 3介导的亲电子取代,这提供了吲哚取代的3-吡咯啉-2-酮的通路。这些材料的Scholl型氧化环化作用导致相应的3-吡咯啉-2-一稠合的苯并[ a ]咔唑和吲哚[2,3- a ]咔唑的形成。这项工作代表了苯并[ a ]吡咯并[3,4- c ]咔唑-3(8 H)-单环系统的首次合成,而吲哚并[2,3- a ]吡咯并[3,4- c] carbazol-5-one环系统存在于许多生物活性化合物中,包括蛋白激酶C(PKC)抑制剂,星形孢菌素。