The total synthesis of the cyclopeptide biphenomycin B (1b), a compound exhibiting a potent antibacterial activity against Gram-positive bacteria, is described. The non-proteinogenic amino acid (S,S)-diisotyrosine (2) was prepared by enantioselective hydrogenation of the corresponding didehydroamino acids. The 15-membered ansa ring was obtained in 85% yield within 5 minutes by ring closure of the appropriate linear pentafluorophenyl ester in the two phase system chloroform-aqueous sodium hydrogen carbonate without dilution.
报道了环肽化合物
双苯霉素B(1b)的全合成,该化合物展现出对革兰氏阳性细菌的强大抗菌活性。通过对应脱氢
氨基酸的对映选择性氢化,合成了非蛋白质
氨基酸(S,S)-二异
酪氨酸(2)。在未经稀释的
氯仿-
水相
碳酸氢钠两相体系中,通过适当线性
五氟苯酯的环化反应,十五元ansa环在5分钟内以85%的产率获得。