Process for the preparation of 2-(6-subtituted-1,-3-dioxane-4-yl)acetic acid derivatives
申请人:——
公开号:US20030158426A1
公开(公告)日:2003-08-21
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 R
1
, R
2
, and R
3
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 OR
3
group in formula (1) being replaced by an OY group, where X, R
1
and R
2
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.
该发明涉及制备公式(1)中2-(6-取代-1,3-二氧杂环戊烷-4-基)乙酸衍生物,其中X代表一个脱离基团,R1、R2和R3各自独立地代表一个碳原子数为1-3的烷基基团,来自4-羟基-6-X-取代-甲基-四氢吡喃-2-酮化合物,其中X如上定义,借助缩醛化剂,在酸催化剂存在下进行。该发明还涉及公式(1)中的新化合物以及从中制备的盐和酸,其中公式(1)中的OR3基团被OY基团取代,其中X、R1和R2具有上述定义的含义,Y代表碱性(土)金属或取代或未取代的铵基团或代表氢,并涉及公式(2)的新化合物。所涉产品在转化为2-(6-羟甲基-1,3-二氧杂环戊烷-4-基)乙酸的叔丁基酯之后,在他汀类药物制备中作为中间体产品非常重要。