Cw. Jefford et al., A CONCISE ENANTIOSELECTIVE SYNTHESIS OF N-MORPHOLINOSPHINGOSINES FROMD-ASPARTIC ACID, Journal of the Chemical Society, Chemical Communications, (2), 1995, pp. 123-124
D-Aspartic acid, by N-tosylation, anhydride formation, reduction, alph
a-hydroxylation and iodo-esterification, gives ethyl 2R,3R)-3-[(N-tosy
l)amino]-2-hydroxy-4-iodobutyrate which, by treatment with morpholine,
silylation, DIBAH reduction, Wittig reaction and deprotection, gives
the N-morpholinosphingosine 13 in an overall yield of 27%.