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    • 2. 发明公开
    • IMPROVED PROCESS FOR THE PREPARATION OF 2-SUBSTITUTED-2-(6-(SUBSTITUTED)-7-METHYLBENZO[D][1,3]DIOXOL-4-YL)ACETIC ACID DERIVATIVES
    • VERBESSERTES VERFAHREN ZUR HERSTELLUNG VON 2-SUBSTITUT-2-(6-(SUBSTITUT-)7-甲基苯并[D] [1,3]二氧杂环戊烯-4-基) - 苯甲酰胺
    • EP2861572A1
    • 2015-04-22
    • EP13750150.8
    • 2013-06-19
    • Natco Pharma Limited
    • MUDDASANI, Pulla ReddyCHINTALAPUDI, ManikumarNANNAPANENI, Venkaiah Chowdary
    • C07D317/64C07C15/02
    • C07D317/64C07C43/23C07C59/64C07C69/734C07D309/12C07F7/1804Y02P20/55
    • Present invention relates to an improved and commercial process for the preparation of 2-sustituted-2-(6-(substituted)-7-methylbenzo[d][1,3]dioxol-4-yl)acetic acid derivatives of formula-I the above Formula I, XII, XIII, XV, wherein R1 is a O-protecting group such as methoxymethyl, ethoxymethyl, trialkylsilyl, arylmethyl, tetrahydropyran-2-yl, allyl; X is hydroxyl, halogen, mesylate, triflate, tosylate, acetate; Y is oxygen atom, NH or sulfur atom; R2 is C1-C6 alkyl. 2,4-Dihydroxy-3-methylbenzaldehyde is selectively protected at C-4 position in the form of an ether compound of formula-XII, oxidized the aldehyde function to get the diol of formula-XIII, and condensed with ethyl glyoxalate under Casiraghi reaction conditions to get the compound of formula-XV. Compound of formula-XV is converted to compound of formula-I by conventional chemistry. Compounds of formula-I are key intermediates in the synthesis of ecteinascidines like trabectedin.
    • 本发明涉及制备式I的2-取代-2-(6-(取代的)-7-甲基苯并[d] [1,3]二氧杂环戊烯-4-基)乙酸衍生物的改进和商业化方法 上述式I,XII,XIII,XV,其中R 1是O-保护基如甲氧基甲基,乙氧基甲基,三烷基甲硅烷基,芳基甲基,四氢吡喃-2-基,烯丙基; X是羟基,卤素,甲磺酸酯,三氟甲磺酸酯,甲苯磺酸酯,乙酸酯; Y是氧原子,NH或硫原子; R2是C1-C6烷基。 2,4-二羟基-3-甲基苯甲醛在C-4位选择性保护为式-IIII的醚化合物的形式,氧化醛官能团以获得式-IIIIII的二醇,并在卡西拉希反应下与乙醛酸乙酯缩合 得到式XV化合物的条件。 通过常规化学方法将式XV的化合物转化为式I的化合物。 式I的化合物是合成类似于trabectinin的ecteinascidine的关键中间体。