ausblenden:
Schlagwörter:
ACID ESTER IMINES; ALKALOIDS; INDOLO<2,3-A>QUINOLIZIDIN-2-ONES; DIELS-ALDER REACTIONS; BISCHLER-NAPIERALSKI REACTIONS; BRASSARDS DIENE; INDOLO[2,3-A]QUINOLIZINES; ALKALOIDS;
Zusammenfassung:
Schiff's bases 3 derived from tryptamine react with Brassard's diene 4 in the presence of EtAlCl2 to give functionalized 1,2,5,6-tetrahydropyridines which are subsequently transformed to indolo[2,3-a]quinolizines 8-10 by the Bischler-Napieralski reaction and reduction of the intermediate iminium salts with NaBH4.