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Zusammenfassung
N-Phthaloyl amino acids were converted by PCl5 into their acid chlorides, which were used to acylate RNH2 (I, R = 2,6-Me2C6H3, PhCH2, and PhCH2CH2) and the amides were hydrazinolyzed to remove the protective group and give D- and L-H2NCHR1CONHR (R as in I, R1 = Me, Me2CH, Me2CHCH2, PhCH2).
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