Total Synthesis of Bistratamides G and H from Various Kinds of ΔAla and ΔAbu-Containing Oligopeptides
作者:Yasuchika Yonezawa、Naoki Tani、Chung-gi Shin
DOI:10.1246/bcsj.78.1492
日期:2005.8
synthesis of naturally occurring bistratamides G (1) and H (2) from various kinds of dehydrooligopeptides is described. First of all, the promising building blocks of 1 and 2: N-2-[(S)-1-(N-benzyloxycarbonyl)amino-2-methyl-propyl]oxazole (4)- and N-2-[(S)-1-(N-t-butoxycarbonyl)amino-2-methylpropyl]thiazol-4-ylcarbonyl}-L-Val-(S)NH 2 (5), and methyl (S)-2-(1-[N-(3-bromo-2-oxopropanoyl)amino-2-methylpropyl
描述了从各种脱氢寡肽合成天然存在的 Bistratamides G (1) 和 H (2)。首先,1和2的有前途的构建块:N-2-[(S)-1-(N-苄氧羰基)氨基-2-甲基-丙基]恶唑(4)-和N-2-[ (S)-1-(Nt-丁氧基羰基)氨基-2-甲基丙基]噻唑-4-基羰基}-L-Val-(S)NH 2 (5)和甲基(S)-2-(1-[N -(3-bromo-2-oxopropanoyl)amino-2-methylpropyl]}-5-methyloxazole-4-carboxylate (6),作为 1 和 2 的线性前体的左半和右半组分,被合成。随后分别在 4 或 5 和 6 之间进行噻唑化,然后将两个形成的线性三杂环肽的 N-和 O-保护基团脱保护。通过在高稀释条件下使用 BOP 作为缩合剂的最终大环化,这些肽得到预期 1 和 2。