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
Access to Indoles via Diels-Alder Reactions of 5-Methylthio-2-vinylpyrroles with Maleimides
作者:Wayland E. Noland、Nicholas P. Lanzatella、Rozalin R. Dickson、Mary E. Messner、Huy H. Nguyen
DOI:10.1002/jhet.1571
日期:2013.7
Diels–Alder reactions of 5‐methylthio‐2‐vinyl‐1H‐pyrroles with maleimides followed by isomerization gave tetrahydroindoles in moderate to good yield. Aromatization using activated MnO2 in refluxing toluene gave the corresponding 2‐methylthioindoles in good yields, and demethylthioation using Raney nickel gave the 2‐H indoles in excellent yields. The protection of the adducts produced aromatization
<i>In situ</i>vinylpyrrole synthesis. Diels-Alder reactions with maleimides to give tetrahydroindoles
作者:Wayland E. Noland、Nicholas P. Lanzatella、Elena P. Sizova、Lakshmanan Venkatraman、Oleg V. Afanasyev
DOI:10.1002/jhet.95
日期:2009.5
been prepared by a one-pot synthesis from 2-alkylpyrroles, cyclic ketones, maleimides, and an acid catalyst. A 5-vinylpyrrole is formed by an acid-catalyzed condensation of a 2-alkyl-substituted pyrrole with a ketone, which is subsequently trapped in situ by a maleimide in a predominantly endo-addition Diels-Alder reaction. Isomerization of the double bond into the pyrrole ring gives a tetrahydroindole
[EN] SULFONYLBENZAMIDE DERIVATIVE AND CONJUGATE THEREOF, PREPARATION METHOD THEREFOR AND USE THEREOF<br/>[FR] DÉRIVÉ DE SULFONYLBENZAMIDE ET SON CONJUGUÉ, PROCÉDÉ DE PRÉPARATION CORRESPONDANT ET UTILISATION ASSOCIÉE<br/>[ZH] 磺酰苯甲酰胺类衍生物及其偶联物、其制备方法及其应用