Palladium(0)-Catalyzed Dearomative [3 + 2] Cycloaddition of 3-Nitroindoles with Vinylcyclopropanes: An Entry to Stereodefined 2,3-Fused Cyclopentannulated Indoline Derivatives
作者:Maxime Laugeois、Johanne Ling、Charlène Férard、Véronique Michelet、Virginie Ratovelomanana-Vidal、Maxime R. Vitale
DOI:10.1021/acs.orglett.7b00784
日期:2017.5.5
The palladium(0)-catalyzed diastereoselective dearomative cyclopentannulation of 3-nitroindoles with vinylcyclopropanes is described. This straightforward and highly atom-economical method leads to a wide range of functionalized indolines in good yields and diastereoselectivities and represents an unprecedented entry toward the valuable 2,3-fused cyclopentannulated indoline scaffold.
3-Nitroindoles are catalytically reduced by hydrogen on palladium/carbon to furnish the relatively unstable aminoindoles, which in the presence of carboxylic acid anhydrides afford good to excellent yields of the corresponding N-acylaminoindoles. 2-Nitroindoles give lower yields of N-acylated 2-aminoindoles.