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    • 6. 发明授权
    • Process for preparing quinazolones
    • 制备喹唑啉酮的方法
    • US5739330A
    • 1998-04-14
    • US596794
    • 1996-02-05
    • Apurba BhattacharyaDiane E. Allen
    • Apurba BhattacharyaDiane E. Allen
    • C07D239/70C07D239/90C07D239/88
    • C07D239/90C07D239/70
    • The present invention provides a process for preparing a quinazolone which comprises the steps of (a) dehydrating a N-acyl beta amino acid in the presence of a dehydration agent and an organic solvent for a sufficient period of time and under suitable temperature and pressure conditions to form an oxazone (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazone to form a mixture, (c) distilling azeotropically said mixture for a suitable period of time and under suitable temperature and pressure conditions to substantially remove said dehydration agent and said organic solvent, and (d) heating the product of step (c) for a sufficient period of time and under suitable temperature and pressure conditions to form said quinazolone.
    • 本发明提供了一种制备喹唑酮的方法,该方法包括以下步骤:(a)在脱水剂和有机溶剂存在下,在适当的温度和压力条件下脱水N-酰基β氨基酸 (b)向所述恶唑酮中加入羧酸和羧酸的伯胺盐以形成混合物,(c)将共沸蒸馏所述混合物一段适当的时间和温度和压力条件下,基本上 除去所述脱水剂和所述有机溶剂,和(d)在合适的温度和压力条件下加热步骤(c)的产物足够的时间以形成所述喹唑啉酮。
    • 9. 发明授权
    • Process for preparing pyrimidine derivatives
    • 嘧啶衍生物的制备方法
    • US5763608A
    • 1998-06-09
    • US595885
    • 1996-02-05
    • Apurba BhattacharyaDiane E. Allen
    • Apurba BhattacharyaDiane E. Allen
    • C07D239/22C07D239/70C07D239/90C07D239/34C07D239/88
    • C07D239/22C07D239/70C07D239/90
    • The present invention provides a process for preparing a 5,6-dihydro-3H-pyrimidin-4-one derivatives which comprises the steps of (a) dehydrating a N-acyl beta amino acid in the presence of a dehydration agent and an organic solvent for a sufficient period of time and under suitable temperature and pressure conditions to form an oxazone (b) adding a carboxylic acid and a primary amine salt of a carboxylic acid to said oxazone to form a mixture, (c) distilling azeotropically said mixture for a suitable period of time and under suitable temperature and pressure conditions to substantially remove said dehydration agent and said organic solvent, and (d) heating the product of step (c) for a sufficient period of time and under suitable temperature and pressure conditions to form said pyrimidin derivatives.
    • 本发明提供一种制备5,6-二氢-3H-嘧啶-4-酮衍生物的方法,其包括以下步骤:(a)在脱水剂和有机溶剂存在下使N-酰基β氨基酸脱水 (b)向所述恶唑酮中加入羧酸和羧酸的伯胺盐以形成混合物,(c)将共沸蒸馏所述混合物用于 适当的时间段和在合适的温度和压力条件下,以基本上除去所述脱水剂和所述有机溶剂,和(d)在合适的温度和压力条件下加热步骤(c)的产物足够的时间以形成所述 嘧啶衍生物。