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 ringexpansion after spirocyclization gave rise to the competitive formation of isomeric spiropyrrolidines and a spiropiperidine, the latter being further transformed into (-)-nitramine.