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ORGANIC LETTERS
卷 14, 期 23, 页码 5996-5999出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol302898h
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- University of Cologne
A short and enantioselective total synthesis of helioporins C and E, which are bioactive marine diterpenes containing a serrulatane or amphilectane skeleton, was elaborated. The chirogenic step, i.e. a Cu(I)-catalyzed allylic alkylation of a cinnamyl chloride with methylmagnesium bromide, proceeded with virtually complete enantioselectivity (99% ee) in the presence of a chiral phosphine-phosphite ligand. The other stereocenters were diastereoselectively established through Me2AlCl-mediated cationic cyclization and Ir-catalyzed hydrogenation.
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