Synthesis of Cyclo[<i>b</i>]fused Carbazoles via SnCl<sub>4</sub>-Mediated Domino Reaction of 2-Indolylmethylpivalates with Arenes and Heteroarenes
作者:Velu Saravanan、Thiyagarajan Mageshwaran、Arasambattu K. Mohanakrishnan
DOI:10.1021/acs.joc.6b01646
日期:2016.9.16
cyclo[b]carbazoles has been developed via SnCl4-mediated one-pot arylation, cyclization and aromatization reaction sequence from 3-acetyl/aroyl-2-pivaloyloxymethylindoles. The starting material is easily accessible from commercially available 2-methylindole via Friedel–Crafts acylation, bromination and pivaloylation. Remarkably, electron withdrawing/donating aroyl units including heterocyclic systems are well
通过SnCl 4介导的一锅芳构化,环化和芳构化反应序列,从3-乙酰基/芳酰基-2-新戊酰氧基甲基吲哚开始开发了芳基和杂芳基环化的环[ b ]咔唑的直接合成方法。起始原料可通过Friedel-Crafts酰化,溴化和吡咯烷化反应从市售2-甲基吲哚轻松获得。值得注意的是,在本多米诺反应方案中,包括杂环系统在内的吸电子/给电子芳基单元具有良好的耐受性。此外,该方法可以扩展为通过2,5-双(2-新戊酰氧基甲基)吡咯的双环合成二苯并呋喃咔唑。
Lewis Acid Mediated One-Pot Synthesis of Aryl/Heteroaryl-Fused Carbazoles Involving a Cascade Friedel-Crafts Alkylation/Electrocyclization/Aromatization Reaction Sequence
作者:Radhakrishnan Sureshbabu、Velu Saravanan、Vasudevan Dhayalan、Arasambattu K. Mohanakrishnan
DOI:10.1002/ejoc.201001309
日期:2011.2
]-fused carbazoles has been developed startingfrom suitably substituted 2/3-(bromomethyl)indoles and ar-enes under Lewisacid catalysis. The attractive feature ofthis protocol is the fact that a wide variety of π-conjugatedannulated carbazoles can be readily accessed by the appro-priate choice of arenes and heteroarenes. The annulationprotocol has been extended to (bromomethyl)benzene aswell as 2,