Synthesis of New Chiral Sulfinyldiacetic Acid Derivatives and Attempt at Chemoselective Asymmetric Pummerer Reaction.
作者:Yoshimitsu Nagao、Satoshi Miyamoto、Kazuhiko Hayashi、Ado Mihira、Shigeki Sano
DOI:10.1248/cpb.50.558
日期:——
of sulfinyldiacetic acid dimethyl ester (8) which was derived from thiodiacetic acid (7). (R(S))-1 (99% ee) and (S(S))-1 (99% ee) were readily obtained by methanolysis of (R(S),S)-12 and (S(S),S)-12 with MeONa in MeOH. (R(S),S)-12 and (S(S),S)-12 were furnished by chromatographic separation of the diastereomeric mixture, obtained by oxidation of thiodiacetic mono-carboxylic acid (11) with 30% H2O2 followed
(R(S))-1(85%ee)是通过猪胰脂肪酶促进的亚硫基二乙酸二甲酯(8)的水解反应制得的,该酯衍生自硫二乙酸(7)。(R(S))-1(99%ee)和(S(S))-1(99%ee)可以通过(R(S),S)-12和(S(S),用MeONa在MeOH中的S)-12。(R(S),S)-12和(S(S),S)-12通过色谱分离非对映混合物得到,该混合物通过用30%H2O2氧化硫代二乙酸单羧酸(11),然后脱水制得生成的亚磺酰基二烯基一元羧酸与4(S)-异丙基-1,3-噻唑烷-2-硫酮的缩合反应。(R(S))-1(99%ee)依次用(TMS)2NLi,Ac2O和TMSOTf处理,以75%ee的高度化学选择性方式产生主要的手性3产物(手性3:手性-2 = 93:7)。