A series of substituted 1,2-dihydro-6-oxo-pyrrolo[3,2,1-ij]quinoline-5-carboxylic acids for the treatment of systemic infections was synthesized via 7-bromo-3-ethylthio-4,5-difluoro-2-methylindole (3), which was prepared by Gassman's indole synthesis in excellent yield. The synthesized pyrroloquinolines were tested for their antibacterial activities. 8-Fluoro-1,2-dihydro-2-methyl-9-(4-methyl-1-piperazinyl)-6-oxo-6H- pyrrolo[3,2,1-ij]quinoline-5-carboxylic acid showed a potent antibacterial activity against gram-positive and gram-negative bacteria.

中文翻译：

---

抗菌剂的研究。二。取代的1,2-二氢-6-氧代-6H-吡咯并[3,2,1-ij]喹啉-5-羧酸的合成及抑菌活性。

通过7-溴-3-乙基硫基-4,5合成了一系列取代的1,2-二氢-6-氧代-吡咯并[3,2,1-ij]喹啉-5-羧酸，用于治疗全身性感染。 -二氟-2-甲基吲哚（3），由加斯曼的吲哚合成制备，收率很高。测试了合成的吡咯并喹啉的抗菌活性。8-氟-1,2-二氢-2-甲基-9-（4-甲基-1-哌嗪基）-6-氧代-6H-吡咯并[3,2,1-ij]喹啉-5-羧酸对革兰氏阳性和革兰氏阴性细菌有很强的抗菌活性。