A thermodynamically controlled stereoselective synthesis of quinolizidinone (+/-)-13 via alpha-amidoalkylation of an intermediate N-acyliminium ion derived from a-ethoxy piperidine 9, followed by intramolecular Michael addition is described. Based on their NMR data, quinolizidine alcohols 14 and 15 were ruled out as possible structures of the lupin alkaloid plumerinine.o TEXTO COMPLETO DESTE ARTIGO, ESTARÁ DISPONÍVEL À PARTIR DE AGOSTO DE 2015.813431346