Enantioselective Synthesis of Epi-Emetine Analogues: Control of the Facial Selectivity in a Three-Component Domino Knoevenagel-Hetero-Diels-Alder Reaction*
作者:Lutz F. Tietze、Nils Rackelmann
DOI:10.1515/znb-2004-0415
日期:2004.4.1
2 and enol ether 3 leads to the cycloadduct rac-17 as the main product which in a second domino process was transformed into the benzoisoquinolizidine rac-18 by solvolysis, hydrogenolysis, condensation and hydrogenation; rac-18 was used as a substrate for the synthesis of the two diastereomeric epiemetine analogues 9 and 10 with > 96% ee (9) and 80% ee (10), respectively, by condensation with the phenylethylamine