The preparation of the (6R)- and (6S)-diastereoisomers of 5-formyltetrahydrofolate (leucovorin)
作者:Jonathan Owens、Lilias Rees、Colin J. Suckling、Hamish C. S. Wood
DOI:10.1039/p19930000871
日期:——
The separation of the (6R)- and (6S)-diastereoisomers of tetrahydrofolic acid by derivatisation on N-5 with chiral auxiliary reagents followed by fractional crystallisation or extraction is described. Chloroformates of chiral alcohols were used as chiral auxiliaries and those derived from cyclic terpene alcohols were found to be most effective for the separation. The cleavage of the derivative and conversion
描述了通过在N-5上用手性辅助试剂衍生化四氢叶酸的(6 R)-和(6 S)-非对映异构体,然后进行分步结晶或萃取的方法。手性醇的氯甲酸酯被用作手性助剂,而衍生自环状萜烯醇的氯甲酸酯对于分离是最有效的。衍生物的裂解和原位转化研究了将5,10-亚甲基四氢叶酸水解后得到5-甲酰基四氢叶酸(亚叶酸钙)的衍生化四氢叶酸;(-)-薄荷醇的化合物是唯一将令人满意的分离与足够的不稳定性结合起来以有效转化为5-甲酰基四氢叶酸的化合物。描述了产物的表征和光学纯度。