Effects of Solvent and Temperature on the 1,4-Asymmetric Induction in the Diastereoselective Hydrogenation of Dehydrodipeptides
作者:Satoru Ikeda、Takamichi Yamagishi、Motowo Yamaguchi、Mitsuhiko Hida
DOI:10.1246/bcsj.62.3508
日期:1989.11
A study of the effets of solvent and temperature on the stereoselectivity of asymmetric hydrogenation of dehydrodipeptides has been made with Rh(I)–(DPP-AE) catalyst, in which an electrostatic interaction is possible between the dimethylamino group of the ligand and the carboxyl group of the substrate. The highest stereoselectivity was attained in the MeOH–water solvent, while aprotic solvents such
使用 Rh(I)-(DPP-AE) 催化剂研究了溶剂和温度对脱氢二肽不对称氢化立体选择性的影响,其中配体的二甲氨基与羧基之间可能发生静电相互作用。基体组。在甲醇-水溶剂中获得了最高的立体选择性,而非质子溶剂如 DMF 和 THF 的选择性和反应性相对较低。在醇溶剂中,随着温度从 -40 °C 增加到 80 °C,立体选择性增加,在 20-40 °C 时达到最大值,然后下降。讨论了溶剂和温度对立体选择性的影响。