Process for the preparation of optically active derivatives of 2-(2-piridylmethylsulfinyl)-benzimidazole, or salts thereof, by resolution of the corresponding racemic derivatives of 2-(2-piridylmethylsulfinyl)-benzimidazole. The resolution is performed through the formation of inclusion complexes with (S)-(−) or (R)-(+)-[1,1′-Binaphthalene]-2,2′-diol in the presence of an amine, followed by the break of the inclusion complex by treatment with an hydroxide of an alkaline metal. The enantiomer of the derivative of 2-(2-piridylmethylsulfinyl)-benzimidazole may be obtained by extractions at a particular pH with a suitable organic solvent. The process allows to perform the resolution with high yields and high optical purity, without using neither toxic solvents nor chromatography.
制备2-(2-
吡啶甲基磺酰基)-
苯并咪唑的光学活性衍
生物或其盐的过程,通过分离对应的2-(2-
吡啶甲基磺酰基)-
苯并咪唑的外消旋衍
生物进行。分离是通过在胺的存在下与(S)-(-)或(R)-(+)-[
1,1'-联萘二
酚]-2,2'
-二醇形成包合物,然后通过用碱
金属的氢氧化物处理包合物来破坏包合物形成的。可以通过在特定pH下使用适当的有机溶剂进行萃取来获得2-(2-
吡啶甲基磺酰基)-
苯并咪唑衍
生物的对映体。该过程允许在高收率和高光学纯度下进行分离,而不使用有毒溶剂或色谱法。