Aerobic oxidative alkynylation of H-phosphonates and amides: an efficient route for the synthesis of alkynylphosphonates and ynamides using a recyclable Cu–MnO catalyst
作者:Harshvardhan Singh、Tapan Sahoo、Chiranjit Sen、Sunil M. Galani、Subhash Chandra Ghosh
DOI:10.1039/c9cy00275h
日期:——
and efficient route for the synthesis of alkynylphosphonates and ynamides by aerobic oxidative alkynylation of H-phosphonates and amides with both aliphatic and aromatic alkynes using our synthesized recyclable heterogeneous Cu–MnO catalyst has been developed. The phosphorylation was carried out under base- and ligand-free conditions, and in the presence of air as the sole oxidant. The reaction is compatible
N-Substitution dependent stereoselectivity switch in palladium catalyzed hydroalkynylation of ynamides: a regio and stereoselective synthesis of ynenamides
作者:Vikas Dwivedi、Madala Hari Babu、Ruchir Kant、Maddi Sridhar Reddy
DOI:10.1039/c5cc06251a
日期:——
A palladium catalysed regioselective hydroalkynylation of ynamides for ynenamides is achieved with an N-substitution dependent stereoselectivity switch.
通过钯催化的选择性加氢炔化反应,可以将炔酰胺转化为烯酰胺,其立体选择性取决于N-取代基的选择。
Visible-Light-Promoted Oxo-Sulfonylation of Ynamides with Sulfonic Acids
作者:Lu Wang、Chengrong Lu、Yanni Yue、Chao Feng
DOI:10.1021/acs.orglett.9b00733
日期:2019.5.17
A visible-light-promoted oxo-sulfonylation of ynamides with sulfonicacids is reported, giving rise to a collection of functionalized α-sulfonylated amides in a straightforward manner. The reaction proceeds sequentially through a cascade of electrophilic addition and photoinduced sulfonyl radical-sustained skeleton rearrangement. The high atom economy, mild reaction conditions, and wide substrate scope
The Dichotomy of Gold‐catalyzed Interplay between Cyanamides and Ynamides: Controllable Switch from [2+2+2] to [4+2] Cycloaddition
作者:Alexey Yu. Dubovtsev、Nikolay V. Shcherbakov、Dmitry V. Dar'in、Vadim Yu. Kukushkin
DOI:10.1002/adsc.202000434
日期:2020.7.16
gold‐catalyzed interplay between cyanamides and ynamides demonstrates condition‐dependent mechanistic dichotomy. [2+2+2] Cycloaddition proceeds under kinetically controlled conditions to give 2,4,6‐triaminopyrimidines (19 examples, up to 99%). Under thermodynamically controlled conditions, the reactivity switches from [2+2+2]‐ to [4+2] cycloaddition; the latter [4+2] reaction accomplishes 1,3‐diaminoisoquinolines
Preparation of (<i>Z</i>)-α,β-Disubstituted Enamides via Palladium-Catalyzed Addition of Boronic Acids to Ynamides
作者:Yuanfa Yang、Lina Wang、Fang Zhang、Gangguo Zhu
DOI:10.1021/jo501894j
日期:2014.10.3
Pd-catalyzed, highly regio- and stereoselective addition of boronic acids to ynamides has been realized. This protocol generates (Z)-α,β-disubstituted enamides in high yields with excellent regio- and stereoselectivity under the mild reaction conditions, thereby providing a good complementary method for the diverse synthesis of multifunctional enamides. A wide collection of functional groups are found