Synthesis of 1-acetoxy-2-methylnaphthalene
    4.
    发明授权
    Synthesis of 1-acetoxy-2-methylnaphthalene 失效
    1-乙酰氧基-2-甲基萘的合成

    公开(公告)号:US5670698A

    公开(公告)日:1997-09-23

    申请号:US699259

    申请日:1996-08-19

    CPC分类号: C07C67/297 C07C67/18

    摘要: A one pot process is provided in which a Mannich base of the formula 5 is reacted with acetic anhydride to produce a diacetate derivative. Without any intermediate isolation, the derivative is hydrogenated to produce a reaction mixture containing 1-acetoxy-2-methylnaphthalene which is readily precipitated from the reaction mixture by addition of water. ##STR1##

    摘要翻译: 提供一锅法,其中式5的曼尼希碱与乙酸酐反应以产生二乙酸酯衍生物。 在不进行任何中间分离的情况下,将衍生物氢化以产生含有1-乙酰氧基-2-甲基萘的反应混合物,其通过加入水容易地从反应混合物中沉淀。 5

    Method of producing DAI from DOPA, using one reaction vessel
    5.
    发明授权
    Method of producing DAI from DOPA, using one reaction vessel 失效
    使用一个反应容器从DOPA生产DAI的方法

    公开(公告)号:US5486619A

    公开(公告)日:1996-01-23

    申请号:US235763

    申请日:1994-04-29

    IPC分类号: C07D209/08

    CPC分类号: C07D209/08

    摘要: A method of producing and isolating 5,6-diacetoxyindole (DAI) in a single reaction vessel comprising the following steps:(a) preparing a first solution comprising dopa, water and a solubilizing agent selected from the group consisting of an acid having a pk.sub.a value equal to or less than 4 and a first base having a pk.sub.b value equal to or greater than 10;(b) preparing a second solution comprising an oxidant, a buffer and water;(c) mixing the first and second solutions to form a combined solution which is rendered oxygen-free and has a pH of from about 6 to about 9;(d) stirring the combined solution in an inert atmosphere until 5,6-dihydroxyindole (DHI) is substantially completely formed;(e) adding a derivatizing agent and a second base to the combined solution to form a final solution;(f) stirring the final solution until the DHI is substantially fully consumed;(g) cooling the final solution to precipitate DAI;(h) isolating the precipitated DAI.

    摘要翻译: 一种在单个反应容器中生产和分离5,6-二乙酰氧基吲哚(DAI)的方法,包括以下步骤:(a)制备包含多巴,水和增溶剂的第一溶液,所述第一溶液选自具有pka 值等于或小于4,以及pkb值等于或大于10的第一碱基; (b)制备包含氧化剂,缓冲剂和水的第二溶液; (c)混合第一和第二溶液以形成无氧的并具有约6至约9的pH的组合溶液; (d)在惰性气氛中搅拌合并的溶液直到5,6-二羟基吲哚(DHI)基本上完全形成; (e)向组合溶液中加入衍生剂和第二碱以形成最终溶液; (f)搅拌最终溶液直到DHI基本上完全消耗; (g)冷却最终溶液以沉淀DAI; (h)分离析出的DAI。