Regioselectivity of the amino-Claisen rearrangement. The rearrangements of N-allyl-9-methoxy-1-oxajulolidinium bromide and N-allyl-8-methoxylilolidinium bromide
Abstract
High regioselectivity was observed in the title rearrangements and the reactions were rationalized as occurring via a transition state which closely resembles the lowest energy valence-bond resonance form.