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New Synthetic Approaches to Heterohelicenes based on Catalytic Domino Cyclization

New Synthetic Approaches to Heterohelicenes based on Catalytic Domino Cyclization

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New Synthetic Approaches to Heterohelicenes based on Catalytic Domino Cyclization
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<strong>Seminar of the School of Physical Sciences -------------------------------------------------</strong> Title:<strong> New Synthetic Approaches to Heterohelicenes based on Catalytic Domino Cyclization</strong> Speaker: <strong>Irie Ryo</strong> (Kumamoto University, Kumamoto) Date:<strong> March 3, 2016</strong> <strong>Abstract: </strong>Extended π-conjugated heterocycles, in which heteroaromatic and aromatic rings are condensed alternately, have aroused enormous interest and have been exploited as components of photoelectronic devices [1]. In this context, it should be intriguing to investigate practical synthesis of heterohelicenes, angularly fused heteroaromatic compounds with helical chirality, for producing novel functional materials of chiroptical properties. Herein, we will report new synthetic approaches to unique heterohelicenes containing a dibenzofuran and a carbazole structure based on the palladium-catalyzed dehydrogenation [2,3] of aromatic diynes and base-catalyzed cycloisomerization [4,5] of o-alkynyl heterobiaryls. The stereochemical behaviour of the heterohelicenes thus obtained will be also presented on the basis of kinetic analysis as well as DFT calculations. 1. Y. Shen, C.-F. Chen, Chemical Reviews, 112(3), 1463-1535, 2012. 2. R. Irie, A. Tanoue, S. Urakawa, T. Imahori, K. Igawa, T. Matsumoto, K. Tomooka, S. Kikuta, T. Uchida, T. Katsuki, Chemistry Letters, 40(12), 1343-1345, 2011. 3. M. Furusawa, T. Imahori, K. Igawa, K. Tomooka, R. Irie, R. Chemistry Letters, 42(10), 1134-1137, 2013. 4. M. Furusawa, K. Arita, T. Imahori, K. Igawa, K. Tomooka, R. Irie, Tetrahedron Letters, 54(52), 7107-7110, 2013. 5. R. Irie, M. Furusawa, K. Arita, K. Igawa, K. Tomooka, Journal of Synthetic Organic Chemistry, Japan, 72(10), 1131-1142, 2014.

A warm welcome to the modified and updated website of the Centre for East Asian Studies. The East Asian region has been at the forefront of several path-breaking changes since 1970s beginning with the redefining the development architecture with its State-led development model besides emerging as a major region in the global politics and a key hub of the sophisticated technologies. The Centre is one of the thirteen Centres of the School of International Studies, Jawaharlal Nehru University, New Delhi that provides a holistic understanding of the region.

Initially, established as a Centre for Chinese and Japanese Studies, it subsequently grew to include Korean Studies as well. At present there are eight faculty members in the Centre. Several distinguished faculty who have now retired include the late Prof. Gargi Dutt, Prof. P.A.N. Murthy, Prof. G.P. Deshpande, Dr. Nranarayan Das, Prof. R.R. Krishnan and Prof. K.V. Kesavan. Besides, Dr. Madhu Bhalla served at the Centre in Chinese Studies Programme during 1994-2006. In addition, Ms. Kamlesh Jain and Dr. M. M. Kunju served the Centre as the Documentation Officers in Chinese and Japanese Studies respectively.

The academic curriculum covers both modern and contemporary facets of East Asia as each scholar specializes in an area of his/her interest in the region. The integrated course involves two semesters of classes at the M. Phil programme and a dissertation for the M. Phil and a thesis for Ph. D programme respectively. The central objective is to impart an interdisciplinary knowledge and understanding of history, foreign policy, government and politics, society and culture and political economy of the respective areas. Students can explore new and emerging themes such as East Asian regionalism, the evolving East Asian Community, the rise of China, resurgence of Japan and the prospects for reunification of the Korean peninsula. Additionally, the Centre lays great emphasis on the building of language skills. The background of scholars includes mostly from the social science disciplines; History, Political Science, Economics, Sociology, International Relations and language.

Several students of the centre have been recipients of prestigious research fellowships awarded by Japan Foundation, Mombusho (Ministry of Education, Government of Japan), Saburo Okita Memorial Fellowship, Nippon Foundation, Korea Foundation, Nehru Memorial Fellowship, and Fellowship from the Chinese and Taiwanese Governments. Besides, students from Japan receive fellowship from the Indian Council of Cultural Relations.