Synthesis of indolizidines and pyrrolizidines through the [2 + 2]cycloaddition of five-membered endocyclic enecarbamates to alkyl ketenes. Unusual regioselectivity of Baeyer-Villiger ring expansions of alkyl aza-bicyclic cyclobutanones.
J Org Chem. 2002 May 31;67(11):3651-61. doi: 10.1021/jo016189u.
J Org Chem. 2002.
PMID: 12027676