| 摘要 |
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 grou p, and R1, R2, and R3 each independently stand for an alkyl group with 1-3 carb on 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 thes e, 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-dioxa ne- 4-yl)acetic acid, important as intermediary products in the preparation of statins. |
