Dehydrooligopeptides. XVI. Convenient Syntheses of Two Kinds of Antrimycins Av and Dv Containing Dehydrovaline Residues
作者:Yutaka Nakamura、Akio Ito、Chung-gi Shin
DOI:10.1246/bcsj.67.2151
日期:1994.8
Eight kinds of peptide antibiotics, antrimycins (1), consist of four sorts of unusual α-amino acids, that is, hydroxymethylserine, (2S,3S)-2,3-diaminobutanoic acid, (S)-2,3,4,5-tetrahydro-3-pyridazinecarboxylic acid, and dehydrovaline (ΔVal) or (E)-dehydroisoleucine (ΔIle) from the N-terminus of 1. The practical syntheses of the three segments containing these four acids, and all of the protected 1 by the usual fragment condensations of the three segments were accomplished. Moreover, after mild deprotection of the protecting groups, the two kinds of 1, antrimycins Av and Dv comprising Ala5–ΔVal6 and Leu5–ΔVal6 segments respectively, were synthesized.
八种肽类抗生素安曲霉素(1)由四种不寻常的α-氨基酸组成,即羟甲基丝氨酸、(2S,3S)-2,3-二氨基丁酸、(S)-2,3,4,5-四氢-3-吡嗪羧酸和脱氢缬氨酸(ΔVal)或(E)-脱氢异亮氨酸(ΔIle),这些氨基酸来自1的N-端。通过三段的常规片段缩合合成了包含这四种酸的三个片段以及所有保护的1。此外,在温和去保护后,合成了两种1,分别是由Ala5–ΔVal6和Leu5–ΔVal6片段组成的安曲霉素Av和Dv。