Enantiodivergent Synthesis of d- and l-erythro-Sphingosines through Mannich-Type Reactions of N-Benzyl-2,3-O-isopropylidene-d-glyceraldehyde Nitrone

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Abstract
4 pages, 2 schemes, 1 table.-- Supporting Information Available: http://pubs.acs.org.The addition of a 2-silyloxy silylketene acetal to N-benzyl-2,3-O-isopropylidene-d-glyceraldehyde nitrone (Mannich-type reaction) can be stereocontrolled to give 2S,3S,4S and 2R,3R,4S adducts as major compounds, depending on whether the reaction is activated with zinc(II) triflate or tin(IV) chloride, respectively. The corresponding major adducts were used for preparing diastereomeric polyhydroxy-β-aminoesters that were further converted into suitable orthogonally protected enantiomeric d- and l-erythro-sphingosines.This study was supported by the Ministerio\ud de Educacion y Ciencia (MEC), FEDER Program\ud (Madrid, Spain, project CTQ2004-0421), and the Gobierno de\ud Aragón (Zaragoza, Spain). P.J. thanks MEC for a FPU predoctoral\ud grant.Peer reviewe