High Chelation Control of Three Contiguous Stereogenic Centers in the Reformatsky Reactions of Indium Enolates with α-Hydroxy Ketones: Unexpected Stereochemistry of Lactone Formation
Srinivasarao Arulananda Babu, Makoto Yasuda, Yuji Okabe, Ikuya Shibata, and Akio Baba*
*Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan, Email: babachem.eng.osaka-u.ac.jp
S. A. Babu, M. Yasuda, Y. Okabe, I. Shibata, A. Baba, Org. Lett., 2006, 8, 3029-3032.
DOI: 10.1021/ol060943m (free Supporting Information)
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The Reformatsky reaction of α-hydroxy ketones with indium enolates furnished highly diastereoselective lactones, while α-alkoxy ketones gave acyclic esters in moderate selectivities. A boat-type of chelated bicyclic transition state involving highly diastereoselective construction of three contiguous stereogenic centers is proposed.
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