Enantiodivergent synthesis of D- and L-erythro-sphingosines through Mannich-type reactions of N-benzyl-2,3-O-isopropylidene-D-glyceraldehyde nitrone.
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-beta-aminoesters that were further converted into suitable orthogonally protected enantiomeric D- and L-erythro-sphingosines.
Merino
Pedro
P
Laboratorio de Sintesis Asimetrica, Departamento de Quimica Organica, Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza, CSIC, E-50009 Zaragoza, Aragon, Spain. pmerino@unizar.es
Jimenez
Pablo
P
Tejero
Tomas
T
D009589:Nitrogen Oxides / Q000737:chemistry; D013110:Sphingosine / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D013237:Stereoisomerism
D009589:Nitrogen Oxides; C481931:erythro-(2R,3S)-sphingosine; C015388:nitrones; D013110:Sphingosine