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Total Syntheses of Anominine and Tubingensin A

by: Ming Bian, Zhen Wang, Xiaochun Xiong, Yu Sun, Carlo Matera, K. C. Nicolaou, Ang Li
J. Am. Chem. Soc. In Journal of the American Chemical Society, Vol. 134, No. 19. (26 April 2012), pp. 8078-8081, doi:10.1021/ja302765m  Key: citeulike:12080746

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Abstract

A divergent strategy for the total syntheses of the indole terpenoid anominine (1) and its natural congener tubingensin A (2) has been developed. The common intermediate 11 bearing all of the required stereogenic centers for both natural products was first assembled by employing a Ueno?Stork radical cyclization and a Sc(OTf)3-mediated Mukaiyama aldol reaction to form the key C?C bonds in a stereocontrolled manner. The route to anominine features a radical deoxygenation followed by an efficient side-chain installation, while the path to tubingensin A exploits a CuOTf-promoted 6π-electrocyclization/aromatization sequence to forge the central region of the pentacyclic scaffold.


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