After forming the piperidine ring, you'll need to introduce the appropriate substituent at the C-3 position. This can often be accomplished through a series of functional group transformations. For example, you might carry out protection of the other functional groups, functionalize C-3, and then remove the protecting groups.
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dibenzyl 1-[(2S,3R,6S)-1-ethoxy-2,3-dihydroxy-1-oxooctadecan-6-yl]hydrazine-1,2-dicarboxylate
