Copper-Catalyzed Aerobic Oxidative Amidation of Terminal Alkynes: Efficient Synthesis of Ynamides
作者:Tetsuya Hamada、Xuan Ye、Shannon S. Stahl
DOI:10.1021/ja077406x
日期:2008.1.1
A copper-catalyzed method for the preparation of ynamides has been identified that proceeds via aerobicoxidative coupling of terminal alkynes with various nitrogen nucleophiles, including cyclic carbamates, amides and ureas, and N-alkyl-arylsulfonamides and indoles.
Ligand-Controlled Regiodivergent Palladium-Catalyzed Hydrogermylation of Ynamides
作者:Vincent Debrauwer、Aneta Turlik、Lénaic Rummler、Alessandro Prescimone、Nicolas Blanchard、K. N. Houk、Vincent Bizet
DOI:10.1021/jacs.0c03556
日期:2020.6.24
Ynamides are fascinating small molecules with complementary reactivities under radical, ionic and metal-catalyzed conditions. We report herein synthetic and DFT investigations of palladium-catalyzed ligand-controlled regiodivergent hydrometallation reactions of ynamides. Germylated and stannylated enamides are obtained with excellent α,E- or β,E-selectivities and a broad functional group tolerance
Palladium‐Catalyzed Silylcyanation of Ynamides: Regio‐ and Stereoselective Access to Tetrasubstituted 3‐Silyl‐2‐Aminoacrylonitriles
作者:Pierre Hansjacob、Frédéric R. Leroux、Vincent Gandon、Morgan Donnard
DOI:10.1002/anie.202200204
日期:2022.3.28
Tetrasubstituted 2-aminoacrylonitriles (α-enaminonitriles) are underinvestigated building blocks due to the lack of methodologies to synthesize them in a controlled manner. A general access to these valuable scaffolds accompanied by mechanistic investigations and DFT calculations is described. This highly regio- and stereoselective strategy relies on the use of the first intermolecular silylcyanation
[3 + 2] annulations of spirocyclopropyl oxindoles with ynamides to offer biologically important spirocyclopenteneoxindoles in high yields with good diastereoselectivities were developed.
Densely substituted amino-functionalized benzofurans were concisely accessed via the first one-potdominooxidation/[3+2] cyclization of a hydroquinone ester and easily accessible ynamides under mild conditions in a short time. The complex benzofurans were able to be efficiently synthesized all from simple and inexpensive starting materials in two steps.