Antiprotozoal thiazoles. 2. 2-(5-Nitro-2-furyl-, thiazolyl-, and 1-methylimidazolyl-)thiazoles
摘要:
Ten 2-substituted 4-thiazolecarboxaldehyde hydrazones bearing 5-nitro-2-furyl, 5-nitro-2-thiazolyl, and 1-methyl-5-nitro-2-imidazolyl functions have been prepared and screened for activity against Trypanosoma cruzi infections in mice. The results permitted the ranking of these substituents in decreasing order of activity: 1-methyl-5-nitro-2-imidazolyl greater than 5-nitro-2-furyl greater than 5-nitro-2-thiazolyl, the last being inactive. Some structural features of the side chain necessary for optimum activity are discussed. The most active compound, 4-[[[2-(1-methyl-5-nitro-2-imidazolyl)-4-thiazolyl]methylene]amino]thiomorpholine 1,1-dioxide, compared favorably with the standard Nifurtimox against three recent clinical isolates of T. cruzi, including one with a high myocardial tissue infiltration.
Some N-hydroxy-N-methylamidines and 1,2,4-oxadiazol-5(2H)-ones
作者:Peter W. Seale、William K. Warburton
DOI:10.1039/p19740000085
日期:——
Aromatic and heterocyclic nitriles react with N-methylhydroxylamine to give N-hydroxy-N-methylamidines (4). The latter, when treated with ethyl chloroformate, give 1,2,4-oxadiazol-5(2H)-ones (9). Sodium borohydride reduces compound (9; R =p-C6H4Cl) to the corresponding oxadiazolidinone (10). The tautomeric structure of p-chlorobenzamide oxime is discussed.
芳族和杂环腈与之反应Ñ -methylhydroxylamine得到Ñ羟基Ñ -methylamidines(4)。当后者用氯甲酸乙酯处理时,得到1,2,4-恶二唑-5(2 H)-一(9)。硼氢化钠将化合物(9; R = p -C 6 H 4 Cl)还原为相应的恶二唑烷酮(10)。讨论了对氯苯甲酰胺肟的互变异构结构。