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机构地区:[1]贵州大学精细化工研究开发中心教育部绿色农药与农业生物工程重点实验室,贵州贵阳550025
出 处:《精细化工》2007年第10期991-995,共5页Fine Chemicals
基 金:贵州省工业攻关项目(黔科合2004GGY021)~~
摘 要:为提高(R)-α-硫辛酸(Ⅱ)合成收率,降低生产成本,以R体α-甲基苄胺拆分6,8-二氯辛酸得到的(R)-6,8-二氯辛酸(Ⅰ)为原料,在水相中采用一步法合成Ⅱ。讨论了摩尔比、反应温度、滴加时间等诸因素对产物收率及比旋光度的影响,获得了较优合成条件:拆分反应中,n(6,8-二氯辛酸)∶n〔(R)-α-甲基苄胺〕=1∶0.48,反应温度35℃,盐酸酸化;取代反应中,n(Ⅰ)∶n(二硫化钠)=1∶1.2,反应温度75℃,滴加时间3.0 h。在该优化条件下,Ⅱ的总收率为30.0%,并在该条件下,将6,8-二氯辛酸投料量扩大至600 g,Ⅰ投料量扩大至222.0 g,所得Ⅱ平均总收率可达34.3%。To increase the yield of (R)-α-lipoic acid ( Ⅱ) and reduce its cost,an one-step synthesis of Ⅱ by using (R)-6,8-dichlorooctanoic acid ( Ⅰ ) as starting material was described. The synthesis steps involved chiral resolution of 6, 8-dichlorooctanoic acid by (R)-α-phenylethylamine and substitution reaction in water phase. The optimized parameters were as follow. In the chiral resolution, n (6,8-dichlorooctanic acid) :n [ (R)-α-phenylethylamine ]= 1:0. 48, and reaction temperature is 35 ℃ ; in the substitution reaction, n ( Ⅰ ) : n ( Na2S2 ) = 1 : 1.2, the reaction temperature is 75℃, and the dropping time keeps 3.0 h. Under the optimal conditions, the total yield of Ⅱ was 30.0%. When starting material 6,8-dichlorooctanic acid was expanded to 600 g and Ⅰ was increased to 222.0 g, the total yield of Ⅱ was up to 34.3%.
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