申请人:Chisso Corporation
公开号:US05292891A1
公开(公告)日:1994-03-08
There are provided novel and optically active 2,2-dimethyl-1,3-dioxin-4-ones which are useful as starting materials for physiologically active compounds, functional materials or the like. Provided are optically active 5,6-epoxyhexanoic acid esters and novel optically active 6-substituted tetrahydropyran-2-one derivatives. That is, optically active 6-chloromethyltetrahydropyran-2-one can be synthesized by lactonizing optically active 2,2-dimethyl-6-(3-chloro-2-hydroxypropyl)-1,3-dioxin-4-one to form optically active 6-chloromethyltetrahydropyran-2,4-dione; reacting the thus formed compound with hydrogen in the presence of a catalyst to obtain optically active 6-chloromethyl-4-hydroxytetrahydropyran-2-one; subjecting this compound to a dehydration reaction, thereby obtaining optically active 6-chloromethyldihydropyran-2-one; reacting this compound with hydrogen in the presence of a catalyst to form optically active 6-chloromethyltetrahydropyran-2-one; and then treating this compound under basic conditions to prepare an optically active 5,6-epoxyhexanoic acid ester represented by the formula (6) ##STR1## (wherein the symbol * represents an asymmetric carbon atom, and R is a methyl group or an ethyl group).
提供了新颖且光学活性的2,2-二甲基-1,3-二氧杂环丁酮,可用作生理活性化合物、功能材料或类似物的起始材料。提供了光学活性的5,6-环氧己酸酯和新颖的光学活性6-取代四氢吡喃-2-酮衍生物。也就是说,可以通过将光学活性的2,2-二甲基-6-(3-氯-2-羟基丙基)-1,3-二氧杂环丁酮酯化生成光学活性的6-氯甲基四氢吡喃-2,4-二酮;在催化剂存在下用氢气与所形成的化合物反应,得到光学活性的6-氯甲基-4-羟基四氢吡喃-2-酮;将该化合物进行脱水反应,从而得到光学活性的6-氯甲基二氢吡喃-2-酮;在催化剂存在下用氢气与该化合物反应,形成光学活性的6-氯甲基四氢吡喃-2-酮;然后在碱性条件下处理该化合物,制备由式(6)所代表的光学活性的5,6-环氧己酸酯(其中符号*代表一个不对称碳原子,R为甲基或乙基基团)。