Process for P-nitrobenzyl ester cleavage in cephalosporin
    1.
    发明授权
    Process for P-nitrobenzyl ester cleavage in cephalosporin 失效
    头孢菌素中对硝基苄酯切割的方法

    公开(公告)号:US5536830A

    公开(公告)日:1996-07-16

    申请号:US453911

    申请日:1995-05-30

    IPC分类号: C07D501/00 C07D501/04

    CPC分类号: C07D501/00

    摘要: A process for converting cephalosporin p-nitrobenzyl ester (Formula I) to the corresponding cephalosporin free acid (Formula II) comprising treating the cephalosporin p-nitrobenzyl ester with a metal selected from the group consisting of iron, magnesium, aluminum, and tin, and with hydrochloric acid in a mixture of water and a water-miscible organic solvent. Preferably, the metal is iron in the form of a fine powder, and the reaction is carried out at a temperature in the range of 30.degree.-50.degree. C.

    摘要翻译: 一种将头孢菌素对硝基苄基酯(式I)转化成相应的头孢菌素游离酸(式II)的方法,包括用选自铁,镁,铝和锡的金属处理头孢菌素对硝基苄酯,以及 用盐酸与水和水混溶的有机溶剂的混合物。 优选地,金属是细粉末形式的铁,并且反应在30-50℃的温度下进行。

    E-rotamers of 3-hydroy cephem derivatives
    2.
    发明授权
    E-rotamers of 3-hydroy cephem derivatives 失效
    3-羟基头孢烯衍生物的电子旋转异构体

    公开(公告)号:US5631367A

    公开(公告)日:1997-05-20

    申请号:US402095

    申请日:1995-03-10

    CPC分类号: C07D501/00

    摘要: A process for the manufacture of 7-acylamino-3-hydroxy-cephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits different chemical and physical properties from and is more thermodynamically stable than, the Z-rotamer (wherein there is no hydrogen bonding between the 3-hydroxy group and the carbonyl of the 4-ester group).

    摘要翻译: 用于制备E-旋转异构体形式的7-酰基氨基-3-羟基 - 头孢烯-4-羧酸酯-1-氧化物的方法(式III)包括使7-酰基氨基-3-异亚甲基头孢-4-羧酸酯-1-氧化物 氧化物与臭氧在惰性有机溶剂中,在约-80℃至约+20℃的温度范围内,在催化量的有机或无机碱存在下进行。该E-旋转异构体(其中3-羟基 与4-酯基团的羰基结合的强氢键)表现出与Z-旋转异构体(其中3-羟基和羰基之间没有氢键)的化学和物理性质不同,并且比热稳定性更强 4-酯基)。

    Process for preparing Z and E-rotamers of 3-hydroxy cephem derivatives
    3.
    发明授权
    Process for preparing Z and E-rotamers of 3-hydroxy cephem derivatives 失效
    制备3-羟基头孢烯衍生物的Z和E旋转异构体的方法

    公开(公告)号:US5410044A

    公开(公告)日:1995-04-25

    申请号:US19269

    申请日:1993-02-18

    CPC分类号: C07D501/00

    摘要: A process for the manufacture of 7-acylamino-3-hydroxycephem-4-carboxylate-1-oxide in E-rotamer form (Formula III), comprises reacting a 7-acylamino-3-exomethylenecepham-4-carboxylate-1-oxide with ozone in an inert organic solvent in the presence of a catalytic amount of an organic or inorganic base at a temperature ranging from about -80.degree. C. to about +20.degree. C. The E-rotamer (wherein the 3-hydroxy group is strongly hydrogen bonded to the carbonyl of the 4-ester group) exhibits different chemical and physical properties from and is more thermodynamically stable than, the Z-rotamer (wherein there is no hydrogen bonding between the 3-hydroxy group and the carbonyl of the 4-ester group).

    摘要翻译: 以旋转异构体形式(式III)制备7-酰基氨基-3-羟基头孢-4-羧酸-1-氧化物的方法包括使7-酰基氨基-3-异亚甲基头孢-4-羧酸-1-氧化物与 臭氧在惰性有机溶剂中,在约-80℃至约+20℃的温度范围内,在催化量的有机或无机碱的存在下进行.E-旋转异构体(其中3-羟基是强的 与4-酯基的羰基键合的氢)与Z-旋转异构体(其中3-羟基与4-羟基的羰基之间不存在氢键)具有不同的化学和物理性能,并且比热稳定性更强, 酯基)。

    Process for the manufacture of
7-amino-3-exomethylene-3-cepham-4-carboxylic acid ester
    4.
    发明授权
    Process for the manufacture of 7-amino-3-exomethylene-3-cepham-4-carboxylic acid ester 失效
    制备7-氨基-3-异亚甲基-3-头孢烯-4-羧酸酯的方法

    公开(公告)号:US5159071A

    公开(公告)日:1992-10-27

    申请号:US696099

    申请日:1991-05-06

    IPC分类号: C07D501/00 C07D501/04

    CPC分类号: C07D501/00

    摘要: A one-pot process for preparing 7-amino-3-exomethylene-3-cepham-4-carboxylic acid ester (II) comprises: (a) reacting 7-acylamino-3-exomethylene-3-cepham-1-oxide-4-carboxylic acid ester (I) with a silylating agent in an inert solvent and in the presence of a base, (b) adding a phosphorous halide to produce an iminohalide, and (c) adding an anhydrous alcohol. In a preferred embodiment, the silylating agent comprises trimethylchlorosilane, and the phosphorous halide comprises phosphorous pentachloride.

    摘要翻译: 制备7-氨基-3-异亚甲基-3-头孢烯-4-羧酸酯(II)的一锅法包括:(a)使7-酰氨基-3-异亚甲基-3-头孢烯-1-氧化物-4 - 羧酸酯(I)与甲硅烷基化剂在惰性溶剂中并在碱的存在下反应,(b)加入卤化磷以产生亚氨基卤化物,和(c)加入无水乙醇。 在优选的实施方案中,甲硅烷基化剂包括三甲基氯硅烷,并且所述磷酰卤包括五氯化磷。

    Ring-opening process for preparation of 2-chlorosulfinyl azetidinones
    5.
    发明授权
    Ring-opening process for preparation of 2-chlorosulfinyl azetidinones 失效
    开环制备2-氯亚磺酰基氮杂环丁酮的方法

    公开(公告)号:US5070195A

    公开(公告)日:1991-12-03

    申请号:US490151

    申请日:1990-03-07

    IPC分类号: C07D205/095 C07D501/00

    CPC分类号: C07D501/00 C07D205/095

    摘要: An improved method for preparing 2-chlorosulfinyl azetidine-4-one comprises heating a penicillin sulfoxide ester with an N-chlorohalogenating agent at a temperature of about 75.degree. C. to about 140.degree. in an inert organic solvent, and in the presence of an organic solvent insoluble, strongly basic ion exchange resin. Desirably, the ion exchange resin comprises a styrene-divinyl benzane copolymer which is about 2 to 16% cross-linked and incorporates a quaternary ammonium functionality. Such ion exchange resins are commercially available. The 2-chlorosulfinyl azetidine-4-one which is produced by this method can be cyclized in the presence of a Friedel-Crafts catalysts to afford the 3-exomethylene cepham sulfoxide ester in yields of 80-90%.

    摘要翻译: 制备2-氯亚磺酰基氮杂环丁烷-4-酮的改进方法包括在惰性有机溶剂中,在约75℃至约140℃的温度下,用N-氯代卤化剂加热青霉素亚砜酯,并在 有机溶剂不溶,强碱性离子交换树脂。 期望地,离子交换树脂包含交联的约2至16%的苯乙烯 - 二乙烯基苯基共聚物并结合季铵官能团。 这样的离子交换树脂是可商购的。 通过该方法制备的2-氯亚磺酰基氮杂环丁烷-4-酮可以在Friedel-Crafts催化剂存在下环化,得到3-异亚甲基头孢烯亚砜酯,产率为80-90%。

    Process for the preparation of 2-chlorosulfinylazetidinone
    6.
    发明授权
    Process for the preparation of 2-chlorosulfinylazetidinone 失效
    2-氯亚磺酰基氮杂环丁酮的制备方法

    公开(公告)号:US5347000A

    公开(公告)日:1994-09-13

    申请号:US51086

    申请日:1993-04-21

    CPC分类号: C07D501/00 C07D205/095

    摘要: A process for preparing a 2-chlorosulfinylazetidinone comprises heating in an inert organic solvent a penicillin sulfoxide ester, at a temperature between about 75.degree. C. and 140.degree. C., with an N-chlorohalogenating agent in the presence of a weakly basic N-alkali metal salt of a cyclic imide. The weakly basic N-alkali metal salt of a cyclic imide acts as an acid scavenger to bind the hydrogen chloride which is produced as a byproduct of the reaction. Preferably, the N-chlorohalogenating agent is N-chlorosuccinimide or N-chlorophthalimide, and the weakly basic N-alkali metal salt of a cyclic imide is the sodium or potassium salt of succinimide or phthalimide.

    摘要翻译: 制备2-氯亚磺酰基氮杂环丁酮的方法包括在惰性有机溶剂中,在约75℃至140℃之间的温度下,在N-碱式N- 环状酰亚胺的碱金属盐。 环状酰亚胺的弱碱性N-碱金属盐用作酸清除剂,其结合作为反应副产物产生的氯化氢。 优选地,N-氯代卤化剂是N-氯代琥珀酰亚胺或N-氯邻苯二甲酰亚胺,环状酰亚胺的弱碱性N-碱金属盐是琥珀酰亚胺或邻苯二甲酰亚胺的钠盐或钾盐。