Enantioenriched Dihydropyrones from β-Lactone Templates
作者:G. Greg Zipp、Mark A. Hilfiker、Scott G. Nelson
DOI:10.1021/ol025607u
日期:2002.5.1
[reaction: see text] Optically active 4-substituted 2-oxetanones provide conduits for preparing 2,3-dihydro-4H-pyrone heterocycles. Enantioenriched beta-lactones are prepared by asymmetriccatalyticacylhalide-aldehydecyclocondensationreactions. Hydrazone anion-mediated beta-lactone ring opening and ensuing cyclization-dehydroamination of the derived beta-ketohydrazone afford the desired dihydropyrones