Lipidic Peptides, XIV. Conversion of Racemic Lipidic Amino Acids into Sphingosine and Ceramide Analogues and 1,2‐Diamines

N ‐Protected racemic lipidic amino acids 1a – h were converted directly into ceramide analogues 2a – h by chemoselective reduction of their corresponding mixed anhydrides with sodium tetrahydroborate. Conversion of the compounds 1a , b into the corresponding acyl azides, followed by catalytic hydrogenation gave the N ‐monoprotected lipidic 1,2‐diamines 5a , b . The sphingosine analogues 7a – c and the free 1,2‐diamines 6a , b were synthesized by deprotection of the compounds 2a – c and 5a , b , respectively.