Kinetic Resolution of 2-Aryl-4-methylenepiperidines toward Enantioenriched Functionalizable Piperidine Fragments
作者:Anthony Choi、Anthony J. H. M. Meijer、Ilaria Proietti Silvestri、Iain Coldham
DOI:10.1021/acs.joc.2c00862
日期:2022.7.1
The base n-BuLi with sparteine allows a kinetic resolution of N-Boc-2-aryl-4-methylenepiperidines. The 2,2-disubstituted products and recovered starting materials were isolated with high enantiomeric ratios. From VT-NMR spectroscopy and DFT studies, the rate of rotation of the N-Boc group is fast. Lithiation and trapping of the enantioenriched starting materials gave 2,2-disubstituted piperidines with
碱基n - BuLi 与 sparteine 可实现N -Boc -2-aryl-4-methylenepiperidines 的动力学拆分。以高对映体比率分离 2,2-二取代产物和回收的起始材料。根据 VT-NMR 光谱和 DFT 研究, N -Boc 基团的旋转速率很快。对映体富集的起始材料的锂化和捕获得到具有立体化学保留的 2,2-二取代哌啶。4-亚甲基的官能化产生了多种 2,4-二取代哌啶,而不会损失对映纯度,这可能是药物发现的有用构件。