Metal-Free Carbonyl-Assisted Regioselective Hydration of Alkynes: An Access to Dicarbonyls
摘要:
Metal-free regioselective hydration of o-alkynylaldehydes with the assistance of neighboring carbonyl oxygen is disclosed. The developed protocol provides a facile route to synthesize a series of multisubstituted carbonyl containing scaffolds that enable the potential application toward the synthesis of highly diversified 5-azaindoles. gamma-Carbolines and 2,8-diazacarbazoles can also be accessed directly without isolating the dicarbonyl compounds. The developed methodology is operationally simple and environment-friendly, tolerates a wide variety of functional groups, and is applicable toward large scale synthesis.
Metal-Free Carbonyl-Assisted Regioselective Hydration of Alkynes: An Access to Dicarbonyls
摘要:
Metal-free regioselective hydration of o-alkynylaldehydes with the assistance of neighboring carbonyl oxygen is disclosed. The developed protocol provides a facile route to synthesize a series of multisubstituted carbonyl containing scaffolds that enable the potential application toward the synthesis of highly diversified 5-azaindoles. gamma-Carbolines and 2,8-diazacarbazoles can also be accessed directly without isolating the dicarbonyl compounds. The developed methodology is operationally simple and environment-friendly, tolerates a wide variety of functional groups, and is applicable toward large scale synthesis.
A catalyst-free, efficient green MCR protocol for access to functionalized γ-carbolines in water
作者:Anuradha Dagar、Soumen Biswas、Sampak Samanta
DOI:10.1039/c5ra08422a
日期:——
functionalized γ-carboline derivatives has been successfully realized in water through a one-pot three-component reaction involving several aryl/hetero-aryl/alkyl/alkenyl/alkynyl/ferrocenyl aldehydes, 3-formyl indole derivatives and ammonium acetate as a cheap N-source. The most important feature of the current methodology is that this hetero-annulation reaction of indole to γ-carboline can occur in good
Novel Synthetic Method of 2-(2-Oxoethyl)-1H-indole-3-carbaldehydes
作者:Inga Cikotiene、Rita Buksnaitiene
DOI:10.1055/s-0030-1260317
日期:2011.10
The smooth and regioselective synthesis of 2-(2-oxoethyl)-1H-indole-3-carbaldehydes via silver-catalyzed 6-endo-dig acetalization-cyclization reaction followed by immediate hydrolysis of the unstable 1-alkoxypyrano[4,3-b]indole intermediates is described.
Access to Substituted Carbazoles in Water by a One-Pot Sequential Reaction of α,β-Substituted Nitro Olefins with 2-(3-Formyl-1<i>H</i>-indol-2-yl)acetates
interesting new multifunctional carbazole scaffolds have been prepared in good to excellent yields by an organocatalytic one-pot two-step sequentialreaction between α-alkyl-β-substituted nitroolefins or α-alkyl-δ-substituted nitro-dienes and 2-(3-formyl-1H-indol-2-yl)acetates in water at room temperature followed by treatment with 2 n HCl under mild conditions. This one-pot, organocatalytic, oxidant-free