Syntheses and Antimicrobial Activities of N-Heterocyclic-β-mercaptocinnamamides and Related Compounds
作者:SHINSAKU MINAMI、MASATSUGU TOMITA、KAZUYO KAWAGUCHI
DOI:10.1248/cpb.20.1716
日期:——
In order to obtain useful antimicrobial compounds, a number of N-heterocyclic-β-mercaptocinnamamides (IIIa-i) and related compounds were prepared. N-Heterocyclic phenylpropiolamides (I) were obtained by the reaction of heterocyclic amines with phenylpropioloyl chloride. The addition of thiourea to I gave the isothiuronium salts (II), which were converted into the mercapto compounds (III) with aqueous sodium hydroxide. In the reaction of 2-aminothiazole or 2-amino-4-methylthiazole with phenylpropioloyl chloride in the presence of triethylamine, thiazolo [3, 2-α] pyrimidines (V, VII and VIII) were given together with the expected amides (If and Ig). The hydrolysis of S-[2-(3-methyl-1-phenyl-5-pyrazolyl) carbamoyl-1-phenylvinyl]-isothiourea p-toluenesulfonate (IIe) with aqueous sodium hydroxide at 90° gave 6, 7-dihydro-1, 4-diphenyl-3-methyl-6-oxopyrazolo [3, 4-b] pyridine (IX) and a small amount of the mercapto compound (IIIe). Acyl migration from S to N was found in the acylthio derivatives of N-(2-thiazolyl)-(IIIf) and N-(4-methyl-2-thiazolyl)-β-mercaptocinnamamide (IIIg). Most of the compounds synthesized were considerably active in vitro against various gram-positive bacteria and fungi. However, only three of them were effective against Trichophyton in the in vivo tests.
为了得到有用的抗菌化合物,制备了一系列 N-杂环-β-巯基肉桂酰胺(IIIa-i)及相关化合物。通过杂环胺与苯基丙炔酰氯的反应,得到了 N-杂环苯基丙炔酰胺(I)。向 I 中加入硫脲得到异硫脲盐(II),再用氢氧化钠水溶液将其转化为巯基化合物(III)。在三乙胺存在下,2-氨基噻唑或 2-氨基-4-甲基噻唑与苯基丙炔酰氯反应,得到了噻唑并[3, 2-α]嘧啶(V、VII 和 VIII)及预期的酰胺(If 和 Ig)。在 90°C 下用氢氧化钠水溶液水解 S-[2-(3-甲基-1-苯基-5-吡唑基)氨基甲酰-1-苯基乙烯基]-硫脲对甲苯磺酸盐(IIe),得到了 6, 7-二氢-1, 4-二苯基-3-甲基-6-氧代吡唑并[3, 4-b]吡啶(IX)及少量巯基化合物(IIIe)。在 N-(2-噻唑基)(IIIf)和 N-(4-甲基-2-噻唑基)-β-巯基肉桂酰胺(IIIg)的酰硫衍生物中,发生了酰基从硫向氮的迁移。所合成的大多数化合物对多种革兰氏阳性细菌和真菌的体外活性相当高。然而,在体内测试中,仅三种化合物对毛癣菌有效。