If the starting material has an amine group, it is often protected to prevent unwanted reactions during subsequent steps. Common protecting groups for amines include Boc (tert-butyloxycarbonyl) or Fmoc (9-fluorenylmethyloxycarbonyl). This step is crucial for selective functionalization of the β-carbon.
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methyl S-(p-methylbenzyl)-β,β-pentamethylenecysteinate
(2R,3S,4R)-3,4-dihydroxy-2-(hydroxymethyl)pyrrolidine hydrochloride
3-bromo-4-nitro-1-(toluene-4-sulfonyl)-1H-indole
(4R)-5-acetamido-4,8-anhydro-7,9-O-benzylidene-1,2-O-cyclohexylidene-5-deoxy-4-C-nitro-D-gluco-L-erythro-nonitol
N-Acetylneuraminic acid
N-ACETYL-D-GLUCOSAMINE
(3aR)-7t-acetoxy-6c-acetoxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazole
(3aR)-6c-hydroxymethyl-4c-methoxy-2-phenyl-(3ar,7ac)-3a,6,7,7a-tetrahydro-4H-pyrano[3,4-d]oxazol-7t-ol
