4‐(Dimethylamino)Pyridinium Azide in Protic Ionic Liquid Media as a Stable Equivalent of Hydrazoic Acid
作者:Ivan A. Andreev、Maksim A. Boichenko、Nina K. Ratmanova、Olga A. Ivanova、Irina I. Levina、Victor N. Khrustalev、Igor A. Sedov、Igor V. Trushkov
DOI:10.1002/adsc.202200486
日期:2022.7.19
We report a procedure for the multigram synthesis of 4-(dimethylamino)pyridinium azide, a stable, non-explosive, low-hygroscopic source of azide ion soluble in both protic and aprotic organic solvents. In protic ionicliquid media this reagent was shown to serve as a safer equivalent of toxic and unstable hydrazoic acid. The synthetic utility of this system was demonstrated using donor-acceptor cyclopropane
(3 + 3)-Cyclodimerization of Donor–Acceptor Cyclopropanes. Three Routes to Six-Membered Rings
作者:Olga A. Ivanova、Ekaterina M. Budynina、Alexey O. Chagarovskiy、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/jo201612w
日期:2011.11.4
The ability of donor acceptor cyclopropanes to (3 + 3)-cyclodimerize is disclosed. It has been found that Lewis acid-induced transformations of 2-(hetero)arylcyclopropane-1,1-dicarboxylates containing electron-abundant aromatic substituents led to the construction of six-membered cyclic systems. Depending on the substrate properties and the Lewis acid applied, three types of products can be obtained: (1) 1,4-diarylcyclohexanes, (2) 1-aryl-1,2,3,4-tetrahydronaphthalenes, and (3) 9,10-dihydroanthracenes.
Protic Ionic Liquid as Reagent, Catalyst, and Solvent: 1‐Methylimidazolium Thiocyanate
作者:Ivan A. Andreev、Nina K. Ratmanova、André U. Augustin、Olga A. Ivanova、Irina I. Levina、Victor N. Khrustalev、Daniel B. Werz、Igor V. Trushkov
DOI:10.1002/anie.202016593
日期:2021.3.29
ring‐opening of donor‐acceptorcyclopropanes. A wide variety of activated cyclopropanes were found to react with 1‐methylimidazolium thiocyanate under mild metal‐free conditions via unusual nitrogen attack of the ambident thiocyanate ion on the electrophilic center of the three‐membered ring affording pyrrolidine‐2‐thiones bearing donor and acceptor substituents at the C(5) and C(3) atoms, respectively
Ir-Catalyzed Chemoselective Reductive Condensation Reactions of Tertiary Amides with Active Methylene Compounds
作者:Dong-Ping Wu、Wei Ou、Pei-Qiang Huang
DOI:10.1021/acs.orglett.2c02045
日期:2022.7.29
The catalytic reductive condensation reactions of tertiary amides with activemethylene compounds leading to multifunctionalized non-N-containing products is described. The reactions proceed through sequential iridium-catalyzed hydrosilylation of the amides followed by acid-mediated condensation with the activemethylene compounds. This scalable method is broad in scope and shows remarkable chemoselectivity