作者:Velu Saravanan、Bose Muthu Ramalingam、Arasambattu K. Mohanakrishnan
DOI:10.1002/ejoc.201301524
日期:2014.2
The totalsynthesis of calothrixinB and its analogs was achieved starting from 2-methylindole. The synthesis involved an electrocyclization of 2-nitroarylvinyl-3-phenylsulfonylvinylindoles as a key step to give 2-nitroaryl-4-methoxy-3-methylcarbazoles. Oxidation of these compounds followed by reductive cyclization led to N-phenylsulfonylquinocarbazoles. These quinocarbazoles underwent hydrolysis and
Calothrixin B 及其类似物的全合成是从 2-甲基吲哚开始的。该合成涉及 2-硝基芳基乙烯基-3-苯基磺酰基乙烯基吲哚的电环化反应,这是获得 2-硝基芳基-4-甲氧基-3-甲基咔唑的关键步骤。氧化这些化合物,然后进行还原环化,生成 N-苯基磺酰基喹咔唑。这些喹咔唑在一锅中进行水解和空气氧化,得到目标化合物。
Synthesis of Calothrixins and Its Analogs Using FeCl<sub>3</sub>-Mediated Domino Reaction Protocol
作者:Bose Muthu Ramalingam、Velu Saravanan、Arasambattu K. Mohanakrishnan
DOI:10.1021/ol4015738
日期:2013.7.19
A novel one pot synthesis of calothrixin B and its analogs is achieved involving an FeCl3-mediated domino reaction of enamines in dry DMF at reflux. Alternatively, the enamines upon interaction with CuBr2 in DMF at reflux led to the formation of 1-phenylsulfony-2-(2'-nitroaryl)-4-hydroxycarbazole-3-carbaldehydes in excellent yields.