Access to indoles<i>via</i>Diels-Alder reactions of 2-vinylpyrroles with maleimides
作者:Wayland E. Noland、Nicholas P. Lanzatella、Lakshmanan Venkatraman、Nicholas F. Anderson、Glen C. Gullickson
DOI:10.1002/jhet.198
日期:2009.11
Variously substituted 2‐vinylpyrroles underwent an endo‐addition [4+2] cycloaddition reaction with maleimides followed by a spontaneous highly diastereoselective (93–98% de) isomerization to give tetrahydroindoles in moderate to excellent yield. Treatment with activated MnO2 in refluxing toluene provided the corresponding indoles in moderate to good yield. This highly convergent methodology for formation