An organophosphine‐catalyzed enantioselective cyanosilylation of carbonyl compounds has been disclosed for the first time. This process, the dual‐reagent catalysis serves as a powerful tool, affording the desired cyanohydrin trimethylsilyl ethers in excellent yields (up to 99 %) and good‐to‐excellent enantioselectivities (up to 94 % ee).
Synthesis of π-Extended Heterocycles via Rh(III)-Catalyzed Oxidative Annulation of 5-Aryl Pyrazinones with Alkynes
作者:Harin Oh、Hee Won Byun、Kyeongwon Moon、Saegun Kim、Prithwish Ghosh、Won An、Jong Hwan Kwak、Jung Su Park、Neeraj Kumar Mishra、In Su Kim
DOI:10.1021/acs.joc.1c01752
日期:2021.12.3
The Rh(III)-catalyzed C–H functionalization and subsequent oxidative annulation between 5-aryl pyrazinones and internalalkynes are reported. This protocol provides facile access to a wide range of pyrazinone-linked naphthalenes via the C(sp2)–H alkenylation and subsequent annulation. This transformation is characterized by mild conditions, simplicity, and excellent functional group compatibility.
Electrochemical Synthesis of α-Ketoamides under Catalyst-, Oxidant-, and Electrolyte-Free Conditions
作者:Jin-Yang Chen、Hong-Yu Wu、Qing-Wen Gui、Xiao-Ran Han、Yan Wu、Kui Du、Zhong Cao、Ying-Wu Lin、Wei-Min He
DOI:10.1021/acs.orglett.0c00387
日期:2020.3.20
method for the preparation of α-ketoamides through the direct electrochemical amidation of α-ketoaldehydes and amines with innocuous hydrogen as the sole byproduct at ambient temperature was developed. The present reaction features clean and mild conditions, excellent functional-group tolerance, and high atom economy and scalability, enabling facile applications in pharmaceutical chemistry.
iodine-mediated oxidative annulation of aryl acetylenes-arylethenes-aromatic ketones with 1,2-diamines for the synthesis of pyrazines and regioselective synthesis of quinoxalines is presented. A multipathway coupled domino approach has been developed for the one-pot synthesis of 1,4-diazines with high functional group compatibility.
One-pot diastereoselective synthesis of functionalized 4,5-dihydropyrroles by reactions of arylglyoxals, β-dicarbonyl compounds, and aromatic amines
作者:Nadezhda N. Kolos、Sergey A. Karpan、Irina V. Omelchenko、Natal’ya V. Chechina、Feodor G. Yaremenko
DOI:10.1007/s10593-019-02544-z
日期:2019.9
A multicomponent reaction of arylglyoxal hydrates, acetylacetone or acetoacetic ester, aniline or its 3(4)-substituted analogs in 1:1:2 ratio occurred upon stirring in methanol, giving 4-arylamino-5-hydroxypyrroline derivatives containing 4,5-dihydroxypyrrolines as impurities.