Sulfonamide-directed gold-catalyzed [2+2+2]-cycloadditions of nitriles with two discrete ynamides to construct 2,4-diaminopyridine cores
作者:Yu-Ling Chen、Pankaj Sharma、Rai-Shung Liu
DOI:10.1039/c5cc09688j
日期:——
Gold-catalyzed [2+2+2]-cycloadditions of two discrete ynamides and one one nitrile afford 2,4-diaminopyridine derivatives that are not readily prepared from typical low-valent-metal catalysts. Our mechanistic analysis reveal that the reaction chemoselectivity...
A Two-Carbon Homologation of Aldehydes and Ketones Using Ynamides
作者:Richard Hsung、Lingfeng You、Ziyad Al-Rashid、Ruth Figueroa、Sunil Ghosh、Gang Li、Ting Lu
DOI:10.1055/s-2007-984513
日期:2007.7
Reactions of ynamides with Lewis acid activated -aldehydes, enals, or ketones in the formation of acrylic amides are described here. The overall process is an equivalent of a two-carbonhomologation of aldehydes or ketones and is selective for the E-isomer.
在此描述了炔酰胺与路易斯酸活化的醛、烯醛或酮在丙烯酰胺形成中的反应。整个过程相当于醛或酮的双碳同系化,并且对 E 异构体具有选择性。
Synthesis of (
<i>Z</i>
)‐β‐(Carbonylamino)alkenylindium through Regioselective
<i>anti</i>
‐Carboindation of Ynamides and Its Transformation to Multisubstituted Enamides
an anti-addition, which was supported by DFT calculations. The scope of substrates included various ynamides and silylated nucleophiles, such as silyl ketene acetals and silyl ketene imines. The transformation of synthesized alkenylindiums by iodination, radical coupling, and Pd-catalyzed cross-coupling successfully afforded trisubstituted enamines with high regio- and stereoselectivities.
Copper-Catalyzed Arylative Meyer-Schuster Rearrangement of Propargylic Alcohols to Complex Enones Using Diaryliodonium Salts
作者:Beatrice S. L. Collins、Marcos G. Suero、Matthew J. Gaunt
DOI:10.1002/anie.201301529
日期:2013.5.27
Free choice: A copper‐catalyzed arylativeMeyer–Schusterrearrangement is described. The reaction is compatible with a range of substituted propargylicalcohols and diaryliodoniumsalts and delivers complex trisubstituted enone products selectively as the E isomers.