Intramolecular Hydride Addition to Pyridinium Salts: New Routes to Enantiopure Dihydropyridones
作者:Timothy J. Donohoe、Matthew J. Connolly、Akshat H. Rathi、Lesley Walton
DOI:10.1021/ol200478p
日期:2011.4.15
The transformation of a simple disubstituted pyridine into a pyridinium ion bearing an exocyclic hydroxyl group, protected as a silane, enabled an intramolecular hydride transfer reaction to take place when fluoride was used as a nucleophile. The addition was both regio- and stereoselective and enabled the formation of enantiopure dihydropyridones when enantiopure pyridine derivatives were used in
当氟化物用作亲核试剂时,简单的二取代吡啶向带有被保护为硅烷的环外羟基的吡啶鎓离子的转化使得能够进行分子内氢化物转移反应。当在该序列中使用对映纯吡啶衍生物时,添加是区域选择性和立体选择性的,并且能够形成对映纯二氢吡啶酮。杂环产物具有足够的官能度,可用于进一步的精制反应和随后的衍生化反应。