Three series of isatin derivatives [3-hydrazino, 3-thiosemicarbazino, and 3-imino carboxylic acid derivatives] were synthesized employing microwave irradiation. The prepared compounds were characterized by FT-IR, NMR, elemental analysis, and X-ray crystallography for derivatives5b. The synthesized compounds were screened for antimicrobial activity against selected bacteria and fungi. The results revealed that theN-alkyl isatin derivatives were biologically active with different spectrums activity. Most of the 3-hydrazino and 3-thiosemicarbazino isatin derivatives were biologically inactive and generally the active derivatives showed weak to moderate activity mainly against Gram-positive bacteria. The imino isatin carboxylic acid derivatives (2-[4-(1-benzyl-5-bromo-2-oxoindolin-3-ylideneamino) phenyl]acetic acid,5d) showed promising activity against all tested Gram-positive bacteria and against fungal pathogens.
三系列吲哚啉衍生物[3-肼基,3-硫脲基和3-亚胺羧酸衍生物]利用微波辐射合成。制备的化合物通过FT-IR、NMR、元素分析和X射线晶体学对衍生物5b进行表征。合成的化合物对选定的细菌和真菌进行抗菌活性筛选。结果显示,N-烷基吲哚啉衍生物具有不同谱活性。大多数3-肼基和3-硫脲基吲哚啉衍生物在生物学上无活性,通常活性衍生物对革兰氏阳性细菌表现出弱到中等的活性。亚胺吲哚羧酸衍生物(2-[4-(1-苄基-5-溴-2-氧吲哚-3-基亚胺基)苯基]乙酸,5d)对所有经测试的革兰氏阳性细菌和真菌病原体表现出有希望的活性。