N-Carboxy α-dehydroamino acid anhydride, derived from N-benzyloxycarbonyl α-dehydroamino acid (DHA) and thionyl chloride, was found to be very useful for the synthesis of N-free DHA ester by alcoholysis and N-acetyl dehydrodipeptide ester by coupling was α-amino acid ester.
N-羧基 α-脱氨基酸酸酐是由 N-苄氧羰基 α-脱氨基酸(DHA)和氯化亚硫酰制得的,发现它在通过醇解合成无氮 DHA 酯和通过偶联合成 N-乙酰脱二肽酯时非常有用。
Dehydrooligopeptides. II. The Synthesis of Dehydrodehydrodipeptides by Direct Coupling and Base-catalyzed β-Elimination
dehydrodipeptides with a hydroxyl group, obtained by the coupling of 1 with a serine or threonine ester, and that of N-protected serine or threonine with 2, followed by mesylation and subsequent base-catalyzedβ-elimination gave a number of 7 substances in good yields. The configurational structures of 7 obtained by both direct condensation and elimination were found to have (Z,Z)-geometry.
Dehydrooligopeptides. III. Synthesis of (<i>Z</i>,<i>Z</i>)- and (<i>Z</i>,<i>E</i>)-Geometric Isomers of Dehydrodipeptides and Their Base-catalyzed Transformation to the Hydantoin Derivatives
N-Benzyloxycarbonyl (Cbz)-(Z,E)-dehydrodipeptides, comprised of both (Z)- and (E)-α-dehydroamino acid residues, were first synthesized by dehydrochlorination of Cbz-(Z)-dehydrodipeptides containing an erythro-3-chloro-2-aminobutanoate moiety. Base-catalyzed transformation of the individual Cbz-(Z, Z)- and (Z, E)-dehydrodipeptides was carried out to give the corresponding new hydantoin derivatives.