In order to explore potent derivatives of pradimicins (PRMs), modification of their C4'-amino group was carried out. 4'-N-Cyano (1, 2), 4'-deamino-4'-nitroguanidino (4), 4'-deamino-4'-ureido (7-9) and 4'-deamino-4'-thioureido (10) derivatives were synthesized by trimethylsilylation of PRMs A and C, followed by condensation with appropriate reagents. 4'-Deamino-4'-guanidino (5) and 4'-deamino-4'-amidino (6) derivatives were synthesized by catalytic hydrogenation of 4 and 2, respectively. 4'-N-Nitroso derivative 3 was prepared by treatment of PRM A with nitrous acid. Among these compounds, the 4'-N-cyano derivative of PRM C (2) exhibited in vitro and in vivo antifungal activities comparable to the parent compounds together with good water-solubility.
为了探索普拉迪米星(PRMs)的强效衍
生物,对其 C4'-
氨基进行了修饰。通过对 PRMs A 和 C 进行三甲基
硅烷化,然后用适当的试剂缩合,合成了 4'-N-Cyano (1, 2)、4'-deamino-4'-nitroguanidino (4)、4'-deamino-4'-ureido (7-9) 和 4'-deamino-4'-thioureido (10) 衍
生物。4'-Deamino-4'-guanidino (5) 和 4'-deamino-4'-amidino (6) 衍
生物分别由 4 和 2 催化加氢合成。4'-N-Nitroso 衍
生物 3 是用
亚硝酸处理 PRM A 而制备的。在这些化合物中,PRM C 的 4'-N-Cyano 衍
生物(2)具有与母体化合物相当的体内外抗真菌活性和良好的
水溶性。