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.
Synthesis and Biological Evaluation of Calothrixins B and their Deoxygenated Analogues
作者:Bose Muthu Ramalingam、Nachiappan Dhatchana Moorthy、Somenath Roy Chowdhury、Thiyagarajan Mageshwaran、Elangovan Vellaichamy、Sourav Saha、Karthikeyan Ganesan、B. Navin Rajesh、Saleem Iqbal、Hemanta K. Majumder、Krishnasamy Gunasekaran、Ramamoorthy Siva、Arasambattu K. Mohanakrishnan
DOI:10.1021/acs.jmedchem.7b01797
日期:2018.2.8
A series of calothrixin B (2) analogues bearing substituents at the ‘E’ ring and their corresponding deoxygenated quinocarbazoles lacking quinone unit were synthesized. The cytotoxicities of calothrixins 1, 2, and 15b–p and quinocarbazole analogues were investigated against nine cancer cell lines. The quinocarbazoles 21a and 25a inhibited the catalytic activity of human topoisomerase II. The plasmid