Highly Stereoselective Synthesis of Novel α-Haloenamides via a Mild and Efficient Hydrohalogenation of Ynamides
摘要:
A highly stereoselective preparation of novel chiral (E)-alpha-haloenamides under mild conditions utilizing magnesium halide salts is described. This unexpected mild and efficient hydrohalogenation reaction highlights another synthetic utility of ynamides.
TMSOTf-mediated approach to 1,3-oxazin-2-one skeleton through one-pot successive reduction-[4 + 2] cyclization process of imides with ynamides
作者:Chen-Chen Zhang、Zhi-Peng Huo、Mei-Lin Tang、Yong-Xi Liang、Xun Sun
DOI:10.1016/j.tetlet.2021.152946
日期:2021.3
A one-pot approach to access functionalized 1,3-oxazin-2-one skeleton has been developed through successive reduction and subsequent [4 + 2] cyclization process of N-Boc lactams with ynamides by TMSOTf. As a result, a number of five to seven membered ring fused bicyclic [1,2-c][1], [3]oxazin-1-ones 12a-m and tricyclic derivatives 13a-f were obtained in moderate to excellent yields with excellent regioselectivities
Cu-Catalyzed Oxidative Amidation of Propiolic Acids Under Air via Decarboxylative Coupling
作者:Wei Jia、Ning Jiao
DOI:10.1021/ol1004615
日期:2010.5.7
A Cu-catalyzed aerobic oxidative amidation of propiolicacids via decarboxylation under air has been developed. Only carbon dioxide is produced as byproduct in this approach. The use of air as oxidant makes this method more useful and easy to handle.
Alkylative carboxylation of ynamides with CO2 and dialkylzinc reagents using a N‐heterocyclic carbene (NHC)–copper catalyst has been developed. A variety of ynamides, both cyclic and acyclic, undergo this transformation under mild conditions to afford the corresponding α,β‐unsaturated carboxylic acids, which contain the α,β‐dehydroamino acid skeleton. The present alkylative carboxylation formally consists
Copper-Mediated N-Alkynylation of Carbamates, Ureas, and Sulfonamides. A General Method for the Synthesis of Ynamides
作者:Joshua R. Dunetz、Rick L. Danheiser
DOI:10.1021/ol035647d
日期:2003.10.1
[reaction: see text] A general amination strategy for the N-alkynylation of carbamates, sulfonamides, and chiral oxazolidinones and imidazolidinones is described. A variety of substituted ynamides are available by deprotonation of amides with KHMDS followed by reaction with CuI and an alkynyl bromide.
[反应:见正文] 描述了氨基甲酸酯、磺酰胺、手性恶唑烷酮和咪唑烷酮的 N-炔基化的一般胺化策略。通过用 KHMDS 对酰胺进行去质子化,然后与 CuI 和炔基溴反应,可以获得各种取代的炔酰胺。
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