Regio- and Diastereoselective Synthesis of Highly Substituted, Oxygenated Piperidines from Tetrahydropyridines
作者:Shuming Chen、Brandon Q. Mercado、Robert G. Bergman、Jonathan A. Ellman
DOI:10.1021/acs.joc.5b00816
日期:2015.7.2
Diastereoselective epoxidation and regioselective ring-opening methods were developed for the synthesis of densely substituted, oxygenated piperidines from two classes of tetrahydropyridines with distinct stereochemical displays of functionalities. A new and practical in situ prepared epoxidation reagent was developed for the diastereoselective epoxidation of one class of sterically hindered tetrahydropyridines
开发了非对映选择性环氧化和区域选择性开环方法,用于从两类具有不同立体化学功能的四氢吡啶合成密集取代的氧化哌啶。开发了一种新型实用的原位制备环氧化试剂,用于一类空间位阻四氢吡啶的非对映选择性环氧化。新型双功能环氧化试剂,2-过氧碳-3,4,5,6-四氟苯甲酸,旨在结合高反应性的过羧酸和侧链羧酸基团,通过氢键与氨基成功地克服空间效应并直接环氧化发生在四氢吡啶的受阻较多的面上。环氧化物与水、醇和 HF 的亲核开环以高区域选择性进行,得到具有相邻四取代碳的哌啶醇产物。