申请人:Sterling Drug Inc.
公开号:US04246420A1
公开(公告)日:1981-01-20
An improved method of preparing 3-(4-pyridinyl)-2-cyclohexen-1-one oxime from ethyl 5-oxo-2-[(4-pyridinyl)-carbonyl]hexanoate is a one pot sequence which comprises first heating ethyl 5-oxo-2-[(4-pyridinyl)carbonyl]hexanoate with excess sulfuric acid, neutralizing the excess acid, extracting the resulting 3-(4-pyridinyl)-2-cyclohexen-1-one with isopropyl alcohol, draining off the heavier aqueous layer, adding hydroxylamine hydrochloride to the isopropyl alcohol solution of said 2-cyclohexen-1-one, stirring the mixture at reflux, basifying the mixture and evaporating it to dryness, and isolating 3-(4-pyridinyl)-2-cyclohexen-1-one oxime from the residue. The oxime is an intermediate for preparing 3-(4-pyridinyl)aniline, in turn, an intermediate for preparing rosoxacin, an antibacterial agent.
从乙基5-氧代-2-[(4-吡啶基)羰基]己酸乙酯制备3-(4-吡啶基)-2-环己烯-1-酮肟的改进方法是一个一锅法序列,首先将乙基5-氧代-2-[(4-吡啶基)羰基]己酸乙酯与过量的硫酸加热,中和过量的酸,用异丙醇提取所得的3-(4-吡啶基)-2-环己烯-1-酮,排除较重的水层,将盐酸羟胺加入所述2-环己烯-1-酮的异丙醇溶液中,在回流下搅拌混合物,碱化混合物并蒸干,从残留物中分离出3-(4-吡啶基)-2-环己烯-1-酮肟。该肟是制备3-(4-吡啶基)苯胺的中间体,进而是制备抗菌剂罗索沙星的中间体。