Auto-Tandem Palladium Catalysis: From Isoxazole to 2-Azafluorenone
摘要:
An auto-tandem palladium catalysis from halogen-substituted isoxazoles and Michael acceptors is described. It involves two mechanistically distinct palladium-catalyzed reactions, a Heck reaction and a rearrangement, leading to 2-azafluorenones. It is the first example of palladium-catalyzed ring opening of isoxazoles and rearrangement of the beta-imino ketone ring-opening product.
One-Pot Copper-Catalyzed Three-Component Reaction of Sulfonyl Azides, Alkynes, and Allylamines To Access 2,3-Dihydro-1H-imidazo[1,2-a]indoles
作者:Bingwei Zhou、Yunkui Liu、Hongwei Jin、Daohong Liu
DOI:10.1055/s-0037-1610739
日期:2020.5
A copper-catalyzed multicomponent reaction of sulfonylazides, alkynes, and allylamines affording 2,3-dihydro-1H-imidazo-[1,2-a]indoles in moderate yields is reported. Four C–N bonds are constructed by way of azide-alkyne cycloaddition (CuAAC) and double Ullmann-type coupling reactions in a one-pot process.
An expedient route to tricyanovinylindoles and indolylmaleimides from <i>o</i>-alkynylanilines utilising DMSO as a one-carbon synthon
作者:Nikita Chakraborty、Anjali Dahiya、Amitava Rakshit、Anju Modi、Bhisma K. Patel
DOI:10.1039/d1ob01086g
日期:——
One-pot effective domino synthesis of tricyanovinylindoles utilising DMSO as a one-carbon surrogate and NH4SCN as the CN source.
一锅法合成三氰乙烯基吲哚,利用二甲基亚砜作为一碳替代物和硫氰酸铵作为氰源。
DBU‐Mediated Synthesis of Aryl Acetylenes or 1‐Bromoethynylarenes from Aldehydes
作者:Yadagiri Thummala、Galla V. Karunakar、Venkata Ramana Doddi
DOI:10.1002/adsc.201801334
日期:2019.2
sequential manner for the synthesis of arylacetylenes and 1,3‐enynes starting directly from commercially available aldehydes. The bicyclic amidine 1,8‐diazabicyclo[5.4.0]undec‐7‐ene (DBU) along with additive NaOH not only exclusively afforded the terminal alkynes directly from the aldehydes, but also enhanced the reaction rate. The dynamic nature of DBU also facilitated the isolation of 1‐bromoalkynes intermediate
Nucleophilic Selenocyclization Reaction of Benzodiynes Promoted by Sodium Selenide: Synthesis of Isoselenochromenes
作者:Adriano Maroneze、Fabíola Caldeira、Davi F. Back、Cristina Wayne Nogueira、Gilson Zeni
DOI:10.1002/asia.202400225
日期:——
We describe here the synthesis of isoselenochromenes via a nucleophilic selenocyclization reaction of benzodiynes with sodium selenide. The central parameters that affect this cyclization reaction were studied, and the best reaction conditions were applied to different substrates to determine the scope of the method. The results indicated that isoselenochromenes were obtained in higher yields when