申请人:Mediolanum Farmaceutici S.R.L.
公开号:US04668784A1
公开(公告)日:1987-05-26
Pyrido-benzothiazine compounds having anti-microbial activity are prepared by (a) reacting 3-chloro-4-fluoroaniline with potassium thiocyanate and bromine to produce 2-amino-6-fluoro-7-chlorobenzothiazole, (b) reacting 2-amino-6-fluoro-7-chlorobenzothiazole with sodium hydroxide to produce the disulfide of 2-amino-5-fluoro 6-chlorothiophenol, (c) reacting the disulfide with sodium monochloroacetate to produce 7-fluoro-8-chloro-2H-1,4-benzothiazin-3(4H)-one, (d) reducing 7-fluoro-8-chloro-2H-1,4-benzothiazin-3(4H)-one to produce 7-fluoro-8-chloro-3,4-dihydro-2H-1,4-benzothiazone, (e) reacting 7-fluoro-8-chloro-3,4-dihydro-2-H-1,4-benzothiazone with ethyl ethoxymethylenemalonate and cyclyzing the intermediate formed with polyphosphoric acid to produce ethyl 9-fluoro-10-chloro-7-oxo-2,3-dihydro-7H-pyrido[1,2,3 de] [1,4]-benzothiazine-6-carboxylate and (f) hydrolyizing the ethyl carboxylate to produce the corresponding carboxylic acid.
制备具有抗微生物活性的吡啶并噻唑化合物的方法如下:(a)将3-氯-4-氟苯胺与硫氰酸钾和溴反应,制备2-氨基-6-氟-7-氯苯并噻唑,(b)将2-氨基-6-氟-7-氯苯并噻唑与氢氧化钠反应,制备2-氨基-5-氟-6-氯硫酚的二硫化物,(c)将二硫化物与单氯乙酸钠反应,制备7-氟-8-氯-2H-1,4-苯并噻嗪-3(4H)-酮,(d)将7-氟-8-氯-2H-1,4-苯并噻嗪-3(4H)-酮还原,制备7-氟-8-氯-3,4-二氢-2H-1,4-苯并噻唑,(e)将7-氟-8-氯-3,4-二氢-2H-1,4-苯并噻唑与乙酰乙氧甲基丙烯酸乙酯反应,并用多聚磷酸酸催化环化反应,制备乙酸乙酯9-氟-10-氯-7-氧代-2,3-二氢-7H-吡啶并[1,2,3-de][1,4]-苯并噻唑-6-羧酸乙酯,(f)水解乙酸乙酯,制备相应的羧酸。