Studies of Unusual Amino Acids and Their Peptides. VII. The Syntheses and the Reactions of Iminopeptides
作者:Takashi Yamada、Kazuko Suegane、Shigeru Kuwata、Hiroshi Watanabe
DOI:10.1246/bcsj.50.1088
日期:1977.5
As a basic study for synthesis of bottromycin, the syntheses and the reactions of iminodipeptides were investigated. Nine N-benzyloxycarbonyl(Z) iminodipeptides were prepared by the condensation of ethyl Z-amino carboximidates with amino acids according to the method of Ried et al. All the imidates were prepared from the corresponding nitriles, and ethyl N-Z-2-pyrrolidinecarboximidate (IIIf) was also
作为bottromycin合成的基础研究,研究了亚氨基二肽的合成和反应。根据 Ried 等人的方法,通过 Z-氨基甲亚氨酸乙酯与氨基酸的缩合反应制备了九个 N-苄氧羰基(Z)亚氨基二肽。所有的亚胺酯均由相应的腈类制备,并且通过 Suydam 等人的方法从 Z-脯氨酸硫代酰胺中成功获得了 NZ-2-吡咯烷甲亚胺酸乙酯 (IIIf)。尽管 Z-(亚氨基脯氨酰)甘氨酸很容易脱保护或酯化,但它的 C 末端不能延长,因为它可能环化成咪唑酮环。通过将羧基置于分子中远离亚氨基的位置,可以避免这种副反应;即,亚胺酯 (IIIf) 可以与甲基甘氨酰苯丙氨酸酯偶联,