Cinchona-derived ammonium salts-catalyzed aza Diels–Alder reaction of Danishefsky’s diene with imines
作者:Yohan Park、Eunyoung Park、Hyojun Jung、Yeon-Ju Lee、Sang-sup Jew、Hyeung-geun Park
DOI:10.1016/j.tet.2010.12.002
日期:2011.2
Described is the efficiency of cinchona-derived quaternary ammonium salts as Lewis acid organocatalysts in aza Diels–Alder reaction of Danishefsky’s diene 1 with imines 2 and 16, providing 1,2-dialkyl-2,3-dihydro-4-pyridinones 3 and cyclic dihydropyridones 17, respectively. Among the nine of cinchonidine-derived quaternary ammonium catalysts prepared, N-2′,3′,4′-trifluorobenzyl-O-benzylcinchonidinum