Process for the preparation of 2-hydroxy carboxylic acids
    1.
    发明申请
    Process for the preparation of 2-hydroxy carboxylic acids 审中-公开
    2-羟基羧酸的制备方法

    公开(公告)号:US20050143600A1

    公开(公告)日:2005-06-30

    申请号:US10808965

    申请日:2004-03-25

    IPC分类号: C07C51/09 C07C51/12

    CPC分类号: C07C51/09 C07C59/08

    摘要: A two step preparation for hydroxy carboxylic acid (e.g. lactic acid) is disclosed. An enol ester (e.g. vinyl acetate) is carbonylated in the presence of a hydroxyl compound (e.g. methanol) using a palladium catalyst having one or more O-, N- and/or P-containing ligands (e.g. PdCl2(PPh3)2), and a solvent at 50-150° C./50-2000 psig to yield hydroxy ester (e.g. methyl lactate) and acetoxy ester (e.g. methyl-2-acetoxy propionate). The second step involves hydrolyzing the products of the carbonylation step using acid catalysts (e.g. TsOH, aq HCl, resin) at 10-125° C. to produce 2-hydroxy carboxylic acids (e.g. lactic acid). The carbonylation and hydrolysis catalysts may be separated and recycled.

    摘要翻译: 公开了羟基羧酸(例如乳酸)的两步制备。 使用具有一个或多个O,N-和/或P的配体(例如PdCl 2)的钯催化剂,在羟基化合物(例如甲醇)的存在下将烯醇酯(例如乙酸乙烯酯)羰基化, (PPh 3 N 2)2)和溶剂在50-150℃/ 50-2000psig下反应,得到羟基酯(例如乳酸甲酯)和乙酰氧基酯 (如甲基-2-乙酰氧基丙酸酯)。 第二步包括在10-125℃下使用酸催化剂(例如TsOH,HCl水溶液,树脂)水解羰基化步骤的产物以产生2-羟基羧酸(例如乳酸)。 羰基化和水解催化剂可以分离和再循环。