[EN] PROCESS FOR THE PREPARATION OF 2-(6-SUBSTITUTED-1,3-DIOXANE-4-YL)ACETIC ACID DERIVATIVES<br/>[FR] PROCEDE DE PREPARATION DE DERIVES D'ACIDE 2-(1,3-DIOXANE-4-YL SUBSTITUE EN 6)ACETIQUE
申请人:DSM NV
公开号:WO2002006266A1
公开(公告)日:2002-01-24
The invention relates to the preparation of 2-(6-substituted-1,3-dioxane-4-yl)acetic acid derivatives of formula (1), where X stands for a leaving group, and R1, R2, and R3 each independently stand for an alkyl group with 1-3 carbon atoms from 4-hydroxy-6-X-substituted-methyl-tetrahydropyran-2-one compounds, where X is as defined above, with the aid of an acetalization agent, in the presence of an acid catalyst. The invention also relates to the novel compounds of formula (1) as well as salts and acids to be prepared from these, with the OR3 group in formula (1) being replaced by an OY group, where X, R1 and R2 have the meanings defined above and where Y stands for an alkaline (earth) metal or a substituted or unsubstituted ammonium group or stands for hydrogen, and to the novel compounds of formula (2). The products concerned are, after conversion into the t-butyl ester of 2-(6-hydroxymethyl-1,3-dioxane-4-yl)acetic acid, important as intermediary products in the preparation of statins.
本发明涉及从4-羟基-6-X-取代甲基四氢吡喃-2-酮化合物(其中X代表离去基,R1、R2和R3分别独立地代表具有1-3个碳原子的烷基基团)中,在醛缩剂的帮助下,在酸催化剂的存在下制备公式(1)的2-(6-取代-1,3-二氧杂环-4-基)乙酸衍生物,所述公式(1)中OR3基团被OY基团取代,其中X、R1和R2具有上述定义,Y代表碱金属或取代或未取代的铵基团或代表氢,以及公式(2)的新化合物,本发明还涉及从这些化合物制备的盐和酸。所述产物在转化为2-(6-羟甲基-1,3-二氧杂环-4-基)乙酸叔丁酯后,作为合成他汀类药物的中间体物质具有重要作用。