A new synthetic route to 7-halo-1-cyclopropyl-6-fluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acid, an intermediate for the synthesis of quinolone antibacterial agents
作者:Hiroshi Egawa、Masahiro Kataoka、Koh-Ichiro Shibamori、Teruyuki Miyamoto、Junji Nakano、Jun-Ichi Matsumoto
DOI:10.1002/jhet.5570240134
日期:1987.1
3 and 16 are useful intermediates for the synthesis of a class of quinolone antibacterial agents. The synthetic route involves two processes; i) construction of the quinoline ring by an intramolecular cyclization accompanied by the elimination of a nitro group and ii) introduction of fluorine atom by replacement of a nitro group with potassium fluoride. 7-(3-Amino-1-pyrroli-dinyl)-1-cyclopropyl-6-fluoro-1
从开始米-fluorotoluene,7-氯-6-氟-和6,7-二氟-1-环丙基-1,4-二氢-4- oxoquino线-3-羧酸,3和16进行合成。化合物3和16是用于合成一类喹诺酮抗菌剂的有用的中间体。合成路线涉及两个过程。i)通过分子内环化并伴随有硝基的消除来构建喹啉环,并且ii)通过用氟化钾取代硝基来引入氟原子。由3或16制备7-(3-氨基-1-吡咯基-二基)-1-环丙基-6-氟-1,4-二氢-4-氧代喹啉-3-羧酸(18)。18的抗菌活性优于环丙沙星(2)。