NC(C(O)CCCCC)C(O)=O.C(OC(=O)C)(=O)C.[C:20]([NH:23][CH:24]([CH:28]([OH:34])[CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])[C:25](O)=[O:26])(=[O:22])[CH3:21].COC(=O)C(NC(=O)C)C(O)CCCCC.[H-].C([Al+]CC(C)C)C(C)C>CO>[C:20]([NH:23][CH:24]([CH:28]([OH:34])[CH2:29][CH2:30][CH2:31][CH2:32][CH3:33])[CH:25]=[O:26])(=[O:22])[CH3:21]Protect the amino function in the 2-amino-3-hydroxy-octanoic acid by conversion thereof to an acetamido function by reaction with acetic anhydride, then esterify the resultant 2-acetamido-3-hydroxyoctanoic acid with methanol; reduce the resultant 2-acetamido-3-hydroxyoctanoic acid methyl ester with di-isobutylaluminum hydride according to known procedures to obtain 2-acetamido-3-hydroxyoctanal.
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