[EN] IMPROVED PROCESS FOR THE PREPARATION OF 2-SUSTITUTED-2-(6-(SUBSTITUTED)-7-METHYLBENZO[D][1,3]DIOXOL-4-YL)ACETIC ACID DERIVATIVES<br/>[FR] PROCÉDÉ PERFECTIONNÉ POUR LA PRÉPARATION DE DÉRIVÉS D'ACIDE 2-(7-MÉTHYLBENZO[D][1,3]DIOXOL-4-YL 6-SUBSTITUÉ)ACÉTIQUE 2-SUBSTITUÉ
申请人:NATCO PHARMA LTD
公开号:WO2013190571A1
公开(公告)日:2013-12-27
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 [Formula should be inserted here], 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
本发明涉及一种改进的商业化过程,用于制备公式-I的2-取代-2-(6-(取代)-7-甲基苯并[d][1,3]二氧杂环戊基)乙酸衍生物,其中R1是O-保护基,如甲氧甲基、乙氧甲基、三烷基硅基、芳基甲基、环戊二氧杂环丙基、烯丙基;X是羟基、卤素、甲烷磺酸酯、三氟甲磺酸酯、对甲苯磺酸酯、乙酸基;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位置被选择性地保护为公式-XII的醚化合物,将醛基氧化得到公式-XIII的二醇,并在Casiraghi反应条件下与乙基乙二醛缩合,得到公式-XV的化合物。公式-XV的化合物通过常规化学方法转化为公式-I的化合物。公式-I的化合物是合成类似曲贝特定(trabectedin)的厄曲替南(ecteinascidine)的关键中间体。