1-Pyrrolidin-1-ylbuta-1,3-dienes as potential 1,5-dipoles; synthesis of pyrrolizines
Abstract
Teutomerization of 1-pyrrolidin-1-ylbuta-1,3-dienes and (hetero)aromatic compounds formally containing this moiety, to the corresponding 1,5-dipoles by a concerted [1,6] hydrogen shift is followed by a 1,5-electrocyclization to give pyrrolizine derivatives.