Syntheses are described of
four peptides with modified leucine-enkephalin sequences in which the native
glycylglycyl segment is replaced by an ω-amino acid residue. o-Nitrophenylthio-ω-amino acids
were used as intermediates, and it was found that the derivatives of
4-aminobutyric and 5-amino-valeric acids undergo facile intramolecular
cyclization under the influence of N,N'-dicyclohexylcarbodiimide.
介绍了
合成了四种具有修饰的亮氨酸-脑啡肽序列的肽,其中的原生
ω-氨基酸残基取代。
的衍生物被用作中间体。
4-氨基丁酸和 5-氨基戊酸的衍生物在 N,,B,C,D,E
N,N'-二环己基碳二亚胺的影响下发生分子内环化。