(S)-5-乙酰胺甲基-3-［(4-取代胺甲基)苯基］-2-噁唑烷酮衍生物的合成及抗菌活性

目的研究噁唑烷酮类衍生物的合成及抗菌活性。方法以4-甲基-3-卤代苯胺为原料，经氯甲酸苄酯酰化、与(R)-丁酸缩水甘油酯环合、甲磺酰化、叠氮化、叠氮还原成胺、胺基乙酰化、苄位溴化得到中间体取代溴苄VIIIa和VIIIb。VIIIa和VIIIb与胺类化合物包括脂肪胺、芳香胺发生取代反应生成IXa和IXb；测定目标化合物的体外抗菌活性。结果设计、合成了51个新化合物，其结构经¹H NMR、元素分析或MS确证。并测定了它们的比旋光度等理化常数。化合物VIIb，IXa1，IXa2，IXa7，IXb1，IXb3，IXb10，IXb16和IXb23对G⁺菌有一定的活性，但不如对照品吗啉噁酮和诺氟沙星。结论在吗啉噁酮结构中苯环4位和吗啉基之间插入亚甲基，不能提高化合物的抗菌活性。

Synthesis and antibacterial activity of (S)-5-acetylaminomethyl-3-[(4-substituted-aminomethyl) phenyl] -2-oxazolindinone derivatives

AIM: To synthesize oxazolindinone derivatives and test their antibacterial activities. METHODS: 3-Halo-4-methylaniline was acylated with benzyl chloroformate, followed by cyclization with (R)-glycidyl butyrate, acylation with methanesulfonyl chloride, substitution with NaN3, reduction with H2 + Pd/C or P(OMe)3 + HCl, acylation with Ac2O, and bromination with NBS to form bromides VIIIa and VIIIb, Substitution of the bromides with various amines including aliphatic amine and aromatic amine provided the target compounds IXa and IXb. The in vitro antibacterial activity of the target compounds was tested. RESULTS: Fifty one new compounds were designed and synthesized. And their structures were confirmed by 1H NMR and elemental analyses or MS. Some physical constants such as [alpha]D25 were reported also. Compounds VIIb, IXa1, IXa2, IXa7, IXb1, IXb3, IXb10, IXb16 and IXb23 had moderate in vitro antibacterial activity against G+ bacteria but they were less active than linezolid or norfloxacin. CONCLUSION: Insertion of methylene group between 4-position of phenyl and morpholinyl group in linezolid derivatives can not increase the antibacterial activity.