Synthetic Studies on Indolocarbazoles: Total Synthesis of Staurosporine Aglycon
作者:Ganesan Gobi Rajeshwaran、Arasambattu K Mohanakrishnan
DOI:10.1021/ol200094b
日期:2011.3.18
A synthesis of staurosporine aglycon and its analogs was achieved in a 28−36% overall yield starting from 2-methylindole. The prominent key steps for the synthesis of the indolocarbazole alkaloids involved electrocyclization and nitrene insertion reactions.
A Versatile Construction of the 8H-Quino[4,3-b]carbazole Ring System as a Potential DNA Binder
作者:Arasambattu K. Mohanakrishnan、Panayencheri C. Srinivasan
DOI:10.1021/jo00112a011
日期:1995.4
A short synthesis of the quino[4,3-b]- and quino[3,4-b]carbazoles is reported. The key step of the synthesis involves the preparation of suitable 2,3-divinylindoles by consecutive Wittig reactions. The thermal electrocyclic reaction of the divinylindole with concomitant dehydrogenation in the presence of Pd-C gave the (nitroaryl)carbazole which on reductive cyclization led to the quinocarbazole. The cleavage of the phenylsulfonyl group followed by phosphorus oxychloride treatment and subsequent displacement of the chlorine with 3-(dimethylamino)-1-propylamine gave the title compound in 25% overall yield.
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