Method of producing L-aspartyl-D-alanine-N-(thiethane-3-yl)-amides
    4.
    发明授权
    Method of producing L-aspartyl-D-alanine-N-(thiethane-3-yl)-amides 失效
    L-天冬氨酰-D-丙氨酸-N-(硫醚-3-基) - 酰胺的制备方法

    公开(公告)号:US5874121A

    公开(公告)日:1999-02-23

    申请号:US894518

    申请日:1997-11-21

    CPC分类号: C07K5/06113 Y02P20/55

    摘要: The invention concerns a method of producing L-aspartyl-D-alanine-N-(thietane-3-yl) amides of general formula I by reacting D-alanine-thietane amides of general formula II with oxazolidinone compounds of general formula III in an inert organic solvent, wherein R.sup.1 stands for H or a selectively separable protective group, R.sup.2 -R.sup.5 independently of one another, are identical or different and stand for H or linear or branched C.sub.1 -C.sub.4 -alkyl, and R.sup.6 and R.sup.7, independently of each other, are identical or different and stand for H, linear or branched C.sub.1 -C.sub.4 -alkyl, aryl or a group which activates the carbonyl group. ##STR1##

    摘要翻译: PCT No.PCT / EP96 / 00393 Sec。 371日期:1997年11月21日 102(e)1997年11月21日PCT PCT 1996年1月31日PCT公布。 出版物WO96 / 26213 PCT 日期:1996年8月29日本发明涉及通式I的D-丙氨酸 - 硫杂环丁烷酰胺与通式II的D-丙氨酸 - 硫杂环丁烷酰胺与恶唑烷酮化合物的反应生产L-天冬氨酰-D-丙氨酸-N-(硫杂环丁烷-3-基) 通式III在惰性有机溶剂中,其中R1代表H或选择性可分离的保护基,R2-R5彼此独立地相同或不同,代表H或直链或支链C1-C4烷基,R6和 R 7彼此独立地相同或不同,代表H,直链或支链C 1 -C 4 - 烷基,芳基或活化羰基的基团。 (一)图像(二)<图像>(三)

    Process for preparing sulfonyl halides
    5.
    发明授权
    Process for preparing sulfonyl halides 失效
    制备磺酰卤的方法

    公开(公告)号:US06291710B1

    公开(公告)日:2001-09-18

    申请号:US09382781

    申请日:1999-08-25

    IPC分类号: C07F902

    摘要: A process for preparing compounds of the general formula (I) from compounds of the general formula (II) and sulfite salts with subsequent halogenation. The solvent which is used for halogenation is an organic solvent which is fully or partly miscible with water. The sulfonyl halides are useful for synthesizing bio active substances.

    摘要翻译: 一种由通式(II)的化合物制备通式(I)的化合物和随后卤化的亚硫酸盐的方法。 用于卤化的溶剂是与水完全或部分混溶的有机溶剂。 磺酰卤可用于合成生物活性物质。

    Reactive Extraction of Free Organic Acids from the Ammonium Salts Thereof
    10.
    发明申请
    Reactive Extraction of Free Organic Acids from the Ammonium Salts Thereof 审中-公开
    从其铵盐中反应提取游离有机酸

    公开(公告)号:US20100210871A1

    公开(公告)日:2010-08-19

    申请号:US12706512

    申请日:2010-02-16

    摘要: The invention relates to a process for converting ammonium salts of organic acids to the particular free organic acid, wherein an aqueous solution of the ammonium salt is contacted with an organic extractant and the salt is dissociated at temperatures and pressures at which the aqueous solution and the extractant are in the liquid state, and a stripping medium or entraining gas is introduced in order to remove NH3 from the aqueous solution and transfer at least a portion of the free organic acid formed to the organic extractant. The invention described here thus provides an improved process for releasing an organic acid, preferably a carboxylic, sulphonic or phosphonic acid, especially an alpha-hydroxycarboxylic acid or beta-hydroxycarboxylic acid, from the ammonium salt thereof by release and removal of ammonia and simultaneous extraction of the acid released with a suitable extractant from the aqueous phase. This process corresponds to a reactive extraction. The reactive extraction of an organic acid from the aqueous ammonium salt solution thereof can be improved significantly by the use of a stripping medium or entraining gas, for example nitrogen, air, steam or inert gases, for example argon. The ammonia released is removed from the aqueous solution by the continuous gas stream and can be fed back into a production process. The free acid can be obtained from the extractant by a process such as distillation, rectification, crystallization, re-extraction, chromatography, adsorption, or by a membrane process.

    摘要翻译: 本发明涉及将有机酸的铵盐转化为特定的游离有机酸的方法,其中铵盐的水溶液与有机萃取剂接触,并且盐在水溶液和 萃取剂处于液体状态,并且引入汽提介质或夹带气体以从水溶液中除去NH 3并将至少一部分形成的游离有机酸转移到有机萃取剂中。 因此,这里描述的发明提供了一种通过释放和除去氨并同时提取从其铵盐中释放有机酸,优选羧酸,磺酸或膦酸,特别是α-羟基羧酸或β-羟基羧酸的改进方法 的酸从水相中用合适的萃取剂释放。 该过程对应于反应萃取。 通过使用汽提介质或夹带气体,例如氮气,空气,蒸气或惰性气体,例如氩气,可以显着地改善有机酸从其铵盐水溶液中的反应萃取。 释放的氨通过连续气流从水溶液中除去,并可以反馈到生产过程中。 游离酸可以通过蒸馏,精馏,结晶,再萃取,色谱法,吸附法或膜法等方法从萃取剂得到。