Intramolecular Diels−Alder Reactions of Ester Linked 1,3,9-Decatrienes: Cis/Trans Selectivity in Thermal and Lewis Acid Promoted Reactions of Ethylene-Tethered and Benzo-Tethered Systems
作者:Emma L. Pearson、Laurence C. H. Kwan、Craig I. Turner、Garth A. Jones、Anthony C. Willis、Michael N. Paddon-Row、Michael S. Sherburn
DOI:10.1021/jo0607818
日期:2006.8.1
High cis (i.e., endo) diastereoselectivities are witnessed in heat-promoted intramolecularDiels−Alder (IMDA) reactions of ethylene-tethered hexadienyl acrylates. The cis stereoselectivity is improved by promotion with Et2AlCl. The first examples of Et2AlCl catalyzed intramolecularDiels−Alderreactions of ester-activated dienophiles are reported. In contrast, the corresponding benzo-tethered hexadienyl