Coupling of Carboxylic Acids with Ynamides and Subsequent Rearrangement for the Synthesis of Imides/Amides
作者:Yangyong Shen、Qi Li、Gang Xu、Sunliang Cui
DOI:10.1021/acs.orglett.8b02134
日期:2018.9.7
A coupling of carboxylicacids with ynamides and subsequent rearrangement for the synthesis of imides and amides is reported. The carboxylicacids could couple with ynamides to form α-acyloxyenamide followed by sulfonyl group migration and Mumm rearrangement to furnish the amides. Additionally, the products could be subjected to further rearrangement to deliver β-keto amides. This metal-free process
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。
Palladium-Mediated [2+1] Cycloaddition of Norbornene Derivatives with Ynamides
palladium-catalyzed [2+1] cycloaddition between ynamides and norbornenes or norbornadienes is reported. Both phosphapalladacycles and palladium/secondary phosphine oxide catalytic systems were found to be competent for the transformation allowing the preparation of aminomethylenecyclopropanes. The reaction showed general applicability to various functionalized bicyclo[2.2.1]hept-2-enes and ynamides. A chiral phosphapalladacycle
at the γ-position, were obtained through addition of terminal ynamides with ethyl diazoacetate under copper catalysis for the first time. Regio- and stereoselective hydroamination of those activated N-allenamides provided exclusively E-configured captodative enamimes through a one-pot anti-Michael addition. Numerous ynamides as well as various secondaryamines were adapted in this process.
Palladium-Catalyzed Addition of 1,3-Diones to Ynamides: An Entry to Alkoxy-Substituted Enamides
作者:Lionel V. Graux、Hervé Clavier、Gérard Buono
DOI:10.1002/cctc.201402398
日期:2014.9
metal‐catalyzed addition reaction of 1,3‐diketones to ynamides, which provides access to unprecedented alkoxy‐substituted enamides, is disclosed herein. A screening of catalytic systems showed that both a phosphapalladacycle and a cationic gold complex were capable of promoting this reaction rapidly and cleanly. The scope investigation revealed that variously substituted terminal ynamides and cyclic 1