Process for preparing Valsartan
    1.
    发明申请
    Process for preparing Valsartan 失效
    缬沙坦制备方法

    公开(公告)号:US20060258878A1

    公开(公告)日:2006-11-16

    申请号:US11491638

    申请日:2006-07-24

    IPC分类号: C07C255/49

    CPC分类号: C07D257/04 C07C255/58

    摘要: The invention relates to novel compound of formula (IV), which is an organic acid salt of N-[(2′-cyanobiphenyl-4-yl)methyl]-(L)-valine ester. This compound is an useful intermediate for process of preparation of Valsartan of formula (I), chemically known as (S)—N-(1-Carboxy-2-methylprop-1-yl)-N-pentanoyl-N-[2′-(1H-tetrazol-5-yl)biphenyl-4-ylmethyl]amine. This invention also relates to a process for preparing Valsartan using novel intermediate of formula (IV).

    摘要翻译: 本发明涉及新的式(Ⅳ)化合物,它是N - [(2'-氰基联苯-4-基)甲基] - (L) - 缬氨酸酯的有机酸盐。 该化合物是制备式(I)的缬沙坦的方法的有用的中间体,化学上称为(S)-N-(1-羧基-2-甲基丙-1-基)-N-戊酰基-N- [2' - (1H-四唑-5-基)联苯-4-基甲基]胺。 本发明还涉及使用式(IV)的新型中间体制备缬沙坦的方法。

    Process to obtain 6-O-methylerythromycin a (clarithromycin)_form II
    2.
    发明申请
    Process to obtain 6-O-methylerythromycin a (clarithromycin)_form II 审中-公开
    获得6-O-甲基红霉素a(克拉霉素)的方法II

    公开(公告)号:US20060247427A1

    公开(公告)日:2006-11-02

    申请号:US11491735

    申请日:2006-07-24

    IPC分类号: C07H17/08

    CPC分类号: C07H17/08

    摘要: The present invention provides a process for the preparation of 6-O-methylerythromycin A Form II comprising treating 6-O-methylerythromycin A with organic acid selected form trifluoroacetic acid, para-toluene sulphonic acid, oxalic acid or acetic acid and converting it into an organic salt of 6-O-methylerythromycin A, which can be neutralized by base to give 6-O-methylerythromycin A Form II.

    摘要翻译: 本发明提供了制备6-O-甲基红霉素A形式II的方法,包括用选自三氟乙酸,对甲苯磺酸,草酸或乙酸的有机酸处理6-O-甲基红霉素A,并将其转化为 6-O-甲基红霉素A的有机盐,可通过碱中和得到6-O-甲基红霉素A型II。

    Process for the preparation of (E)-2-cyano-3-(3, 4-dihydroxy-5-nitrophenyl)-N, N-diethyl-2-propenamide (entacapone)
    4.
    发明申请
    Process for the preparation of (E)-2-cyano-3-(3, 4-dihydroxy-5-nitrophenyl)-N, N-diethyl-2-propenamide (entacapone) 审中-公开
    制备(E)-2-氰基-3-(3,4-二羟基-5-硝基苯基)-N,N-二乙基-2-丙烯酰胺(恩他卡朋)的方法,

    公开(公告)号:US20060258877A1

    公开(公告)日:2006-11-16

    申请号:US11448481

    申请日:2006-06-07

    IPC分类号: C07C253/30

    CPC分类号: C07C253/30 C07C255/41

    摘要: The present invention relates to an improved process for the preparation of (E)-N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide formula (I) comprising steps of, (a) condensation of 3,4-dihydroxy-5-nitrobenzaldehyde of formula (II) with N,N-diethylcyanoacetamide of formula (III) in the presence of a catalyst and optionally in the presence of phase transfer catalyst in a solvent selected from the group comprising of ethylacetate, acetonitrile, hydrocarbon such as toluene, xylene and like or mixture thereof to give mixture of (E) and (Z)-isomer of N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide of formula (IV). b) treating an isomeric mixture of (E) and (Z)-isomer of N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide of formula (IV) obtained in step (a) with a halogen in catalytic amounts, in a solvent to give (E)-N,N-diethyl-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)acrylamide formula (I).

    摘要翻译: 本发明涉及制备(E)-N,N-二乙基-2-氰基-3-(3,4-二羟基-5-硝基苯基)丙烯酰胺式(I)的改进方法,包括以下步骤:(a )式(II)的3,4-二羟基-5-硝基苯甲醛与式(III)的N,N-二乙基氰基乙酰胺在催化剂存在下,任选地在相转移催化剂存在下,在选自 包括乙酸乙酯,乙腈,烃如甲苯,二甲苯等或其混合物,得到N,N-二乙基-2-氰基-3-(3,4-二羟基 - (IV)的5-硝基苯基)丙烯酰胺。 b)处理步骤(I)中获得的式(IV)的N,N-二乙基-2-氰基-3-(3,4-二羟基-5-硝基苯基)丙烯酰胺的(E)和(Z) - 异构体的异构体混合物 (E)-N,N-二乙基-2-氰基-3-(3,4-二羟基-5-硝基苯基)丙烯酰胺式(I)的化合物(a)与催化量的卤素反应。