The protected L-aspartic acid is activated as a carboxylic acid derivative suitable for further reactions. One common method is to convert it into an acid chloride using a reagent like thionyl chloride (SOCl2).
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(S)-4-(tert-Butyl-dimethyl-silanyloxymethyl)-1-(4-methoxy-benzyl)-azetidin-2-one
3-(3-carboxy-4-phenyl-butyl)-3,4-dihydro-1H-isoquinoline-2-carboxylic acid tert-butyl ester
Propanamide, N-methyl-N-(4-methylphenyl)-
Oxazole, 2,2'-(1,2-phenylene)bis[4,5-dihydro-4-(1-methylethyl)-, (4S,4'S)-
