Asymmetric Hydrolytic and Aminolytic Kinetic Resolution of Racemic Epoxides using Recyclable Macrocyclic Chiral Cobalt(III) Salen Complexes
作者:Rajkumar Tak、Manish Kumar、Tusharkumar Menapara、Naveen Gupta、Rukhsana I. Kureshy、Noor-ul H. Khan、E. Suresh
DOI:10.1002/adsc.201700788
日期:2017.11.23
New chiral macrocyclic cobalt(III) salen complexes were synthesized and used as catalyst for the asymmetric kinetic resolution (AKR) of terminal epoxides and glycidyl ethers with aromatic/aliphatic amines and water as nucleophiles. This is the first occasion where a Co(III) salen complex demonstrated its ability to catalyze AKR as well as hydrolytic kinetic resolution (HKR) reactions. Excellent enantiomeric
合成了新的手性大环钴(III)salen络合物,并用作端环氧化物和缩水甘油醚与芳香族/脂肪族胺和水为亲核试剂的不对称动力学拆分(AKR)的催化剂。这是Co(III)salen配合物首次证明其催化AKR以及水解动力学拆分(HKR)反应的能力。通过在室温下在二氯甲烷中使用手性Co(III)salen络合物,可实现定量的优异环氧化物,相应的氨基醇和二醇(至多99%)的出色的对映异构体过量。该方案进一步扩展为合成两个重要的药物分子,即(S)-普萘洛尔和(R)-萘哌地尔。还探索了使用二氧化碳作为绿色可再生C 1来源合成手性纯二醇和手性环状碳酸酯的催化体系。在保持对映选择性的情况下,将催化剂循环使用多达5个催化循环。