In a search for a more effective synthetic route for AM-toxins (cyclic tetradepsipeptides), the syntheses of [L-Phe3]AM-toxin II as a preliminary peptide and AM-toxin II as a target were attempted. The cyclization of H–L-Ser(Bzl)-L-Ala–L-Hmb–L-Phe–ONSu (Hmb, 2-hydroxy-3-methylbutanoic acid) in pyridine gave a cyclic monomer in high yield (59%). The removal of O-Bzl in the cyclopeptide and a subsequent
为了寻找更有效的
AM-毒素(环状四肽)合成途径,尝试合成 [L-Phe3]
AM-毒素 II 作为初步肽和
AM-毒素 II 作为靶标。H-L-Ser(Bzl)-L-Ala-L-Hmb-L-Phe-ONSu(Hmb,
2-羟基-3-甲基丁酸)在
吡啶中的环化以高产率(59%)得到环状单体. 去除环肽中的 O-Bzl 并随后用碳二
亚胺-CuCl 使 Ser 脱
水,以 24% 的产率提供 [L-Phe3]
AM-毒素 II。
AM-毒素II以与类似物类似的产率合成。合成
AM-毒素 II 的特征与天然毒素相同。