Enantioselective Total Synthesis of (R)-α-Lipoic Acid: An Application of Thermodynamically Controlled Deracemization of (±)-2-(2-Methoxyethyl)cyclohexanone
作者:Hiroto Kaku、Tetsuto Tsunoda、Natsuko Okamoto、Takeshi Nishii、Mitsuyo Horikawa
DOI:10.1055/s-0030-1258167
日期:2010.9
According to the concept of thermodynamically controlled deracemization, racemic 2-(2-methoxyethyl)cyclohexanone was converted into the R-isomer (99% ee) in 90% yield using (-)-(2R,3R)-trans-2,3-bis(hydroxydiphenylmethyl)-1,4-dioxaspiro[5.4]decane as a host molecule under basic conditions. As an application, a short and enantioselective synthesis of (R)-α-lipoic acid was accomplished in 44% overall
根据热力学控制的脱硫的概念,使用(-)-(2 R,3 R)-反式-2以90%的产率将外消旋的2-(2-甲氧基乙基)环己酮转化为R-异构体(99%ee)。碱性条件下,以3-3-双(羟基二苯甲基)-1,4-二氧杂螺[5.4]癸烷为主体分子。作为一种应用,从(±)-2-(2-甲氧基乙基)环己酮以44%的总收率完成了(R)-α-硫辛酸的短而对映选择性的合成。 (R)-α-硫辛酸-消旋-分子识别-主客体系统-不对称合成