Oxazoline-Based Organocatalyst for Enantioselective Strecker Reactions: A Protocol for the Synthesis of Levamisole
作者:Arghya Sadhukhan、Debashis Sahu、Bishwajit Ganguly、Noor-ul H. Khan、Rukhsana I. Kureshy、Sayed H. R. Abdi、E. Suresh、Hari C. Bajaj
DOI:10.1002/chem.201302007
日期:2013.10.11
catalyze asymmetric Strecker reactions of various aromatic and aliphatic N‐benzhydrylimines with trimethylsilyl cyanide (TMSCN) as a cyanide source at −20 °C to give α‐aminonitriles in high yield (96 %) with excellent chiral induction (up to 98 % ee). DFT calculations have been performed to rationalize the enantioselective formation of the product with the organocatalyst in these reactions. The organocatalyst
已发现基于手性恶唑啉的有机催化剂可在-20°C下有效催化各种芳族和脂族N-苯甲酰肼与三甲基甲硅烷基氰化物(TMSCN)作为氰化物源的不对称Strecker反应,从而以高收率(96%)产生α-氨基腈具有出色的手性诱导作用(高达98% ee)。在这些反应中,已经进行了DFT计算以使产物与有机催化剂的对映选择性形成合理化。有机催化剂已通过单晶X射线衍射分析以及其他分析方法进行了表征。该方案已扩展到以高收率和高对映选择性合成药学上重要的药物分子左旋咪唑。