Hydride-Promoted Ring Expansion of 2-Azaspiropyrrolinium Salts: An Approach Towards the Synthesis of (-)-Nitramine
作者:Norbert De Kimpe、Erick Rosas Alonso、Kourosch Abbaspour Tehrani、Mark Boelens
DOI:10.1055/s-2005-871555
日期:——
synthesis of the spiroalkaloid (-)-nitramine was achieved by electrophile-induced cyclization of a suitably substituted and protected chiral α-allylcy-clohexanecarboxaldimine. Its hydride-promoted ring expansion after spirocyclization gave rise to the competitive formation of isomeric spiropyrrolidines and a spiropiperidine, the latter being further transformed into (-)-nitramine.
通过适当取代和保护的手性 α-烯丙基环己烷甲二亚胺的亲电诱导环化,实现了合成螺生物碱 (-)-硝胺的对映选择性方法。螺环化后其氢化物促进的环扩张引起异构螺吡咯烷和螺哌啶的竞争性形成,后者进一步转化为 (-)-硝胺。