Process for preparing optically active 2-[6-(hydroxy-methyl)-1,3-dioxan-4-yl] acetic acid derivatives
申请人:Nishiyama Akira
公开号:US20050080277A1
公开(公告)日:2005-04-14
The present invention is to provide a production technology by which an optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivative, which are of value as pharmaceutical intermediates, can be produced from inexpensive and readily available starting materials without using any extraordinary equipment such as an ultra-low-temperature reactor. The present invention is a production process of an optically active 2-[6-(hydroxymethyl)-1,3-dioxan-4-yl]acetic acid derivative which comprises reacting an enolate, prepared by permitting a base or a 0-valent metal to act on an acetic acid ester derivative with (S)-β-hydroxy-γ-butyrolactone at a temperature not lower than −30° C. to give a dihydroxyoxohexanoic acid derivative, treating the same with an acylating agent in the presence of a base to produce a dihydroxyoxohexanoic acid monoacyl derivative, reducing this compound with a microorganism to produce a trihydroxyhexanoic acid monoacyl derivative, treating this compound with an acetal-forming reagent in the presence of an acid catalyst to produce an acyloxymethyldioxanylacetic acid derivative, and finally, subjecting this compound to solvolysis in the presence of a base.
本发明旨在提供一种生产技术,通过该技术可以从廉价且易得的起始材料中生产出具有药物中间体价值的光学活性2-[6-(羟甲基)-1,3-二氧杂环戊-4-基]乙酸衍生物,而无需使用任何特殊设备,如超低温反应器。本发明是一种光学活性2-[6-(羟甲基)-1,3-二氧杂环戊-4-基]乙酸衍生物的生产过程,包括将碱或0价金属作用于乙酸酯衍生物制备出的烯醇,与(S)-β-羟基-γ-丁内酯在不低于-30℃的温度下反应,得到二羟基氧代己酸衍生物,用酰化剂在碱的存在下处理,以产生二羟基氧代己酸单酰衍生物,用微生物还原该化合物以产生三羟基己酸单酰衍生物,用酸催化剂存在下的缩醛试剂处理该化合物,以产生酰氧甲基二氧杂环己酸衍生物,最后,在碱的存在下进行溶剂解离。