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
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.