手性高效液相色谱拆分3-取代异吲哚-1-酮的研究

从伏牛花类植物中提取的生物碱Lennoxam ine^1]、Nuevam ine和Chilenine,新研发的抗焦虑药Paz-inaclone^2]和Pagoclone^3]以及利尿、抗高血压药Chlortalidone^4]等均含有光活性3-取代异吲哚-1-酮(2,3-二氢-1H -异吲哚-1-酮).这类化合物还是一类新型的不对称合成手性辅助基^5].因此,光学纯的3-取代异吲哚-1-酮化合物在药物研发和不对称合成等领域具有应用前景.但有关它们的色谱拆分少见报道^6,7].本文对15个外消旋3-取代异吲哚-1-酮样品进行高效液相色谱拆分研究,通过建立的手性色谱方法,不仅准确测定了相关产物的光学纯度,而且确认了N -取代邻苯二甲酰亚胺上手性辅助基在不对称合成过程^8]中未发生消旋化.同时探讨了样品中3-位取代基对手性拆分的影响.

Enantioseparation of 3-Substituted Isoindolin-1-ones by HPLC

The enantioseparation of 3-alkyl-isoindolin-1-ones（1—9） and 3-alkyl-3-hydroxy-isoindolin-1-ones（10—14）（R=Me,Et,n-Pr,n-Bu,n-C5H11 ,n-C7H15 ,i-Bu,Ph and Bn）,as well as 3-n-heptyl-2-2-hydroxy-1-phenylethyl]-isoindolin-1-one（15） by HPLC using （S）-tert-leucine and （S）-1-α-NEA as a chiral stationary phase,and 1%—6%（volume fraction） 2-propanol or ethanol in hexane as the mobile phase was studied. The effect of content of polar solvent in mobile phase on the enantioseparation was discussed. The effects of 3-substituents on retention factor and chiral recognition were studied. For the majority of racemates（1—14）,a baseline separation could be obtained. For racemate（15）,the elution orders are （3R,1′R）/（3S,1′S） then （3R,1′S）/（3S,1′R） with n-hexane/2-propanol（volume ratio 99∶1） as a mobile phase and the resolutions are 1.44 and 5.58,respectively.