The Catalyst-Controlled Divergent Cascade Reactions of Homo-Propargylic Amines and Nitrones: Synthesis of Pyrrolo-Isoxazolidines and γ-Lactams
作者:Yuanfang Kong、Yingze Liu、Boyi Wang、Shengli Li、Lingyan Liu、Weixing Chang、Jing Li
DOI:10.1002/adsc.201701476
日期:2018.3.20
Two controllable one‐pot cascade cyclization reactions of homopropargylic amines and nitrones were developed by using different metal Cu and Ag salts. The pyrroloisoxazolidines and γ‐lactams were obtained in good to high yields, respectively. Herein, nitrones played dual roles, both as 1,3‐dipoles and oxidants, and four stereocenters were simultaneously formed in the hydroamination cyclization‐1,3‐dipolar
Highlyenantioselectivehydrosilylation of γ-iminoesters with trichlorosilane promoted by a chiral Lewisbase proceeded smoothly to provide various optically active γ-amino esters in good yields (up to 96 %) with excellent enantioselectivities (up to 99 % ee) at –10 °C in Cl2CHCHCl2. The side reactions were successfully reduced by rational modification of the substrate. The absolute configuration
Highly Efficient and Versatile Synthesis of Lactams and <i>N</i>-Heterocycles via Al(OTf)<sub>3</sub>-Catalyzed Cascade Cyclization and Ionic Hydrogenation Reactions
The discovery and development of an efficient and versatile method for the synthesis of N-substituted lactams is described. Pyrrolindinones, piperidones, and structurally related heterocycles were formed by Al(OTf)3-catalyzed cascade cyclization and ionic hydrogenation reactions of corresponding nitrogen substituted ketoamides in good yields.
A Catalyst and Solvent Free Route for the Synthesis of
<i>N</i>
‐Substituted Pyrrolidones from Levulinic Acid
作者:Pritam Dolui、Vikas Tiwari、Parul Saini、Tarak Karmakar、Koushik Makhal、Harshita Goel、Anil J. Elias
DOI:10.1002/chem.202200829
日期:2022.8
This work offers a simple methodolgy to avoid solvents and added catalysts for the synthesis of different kinds of N-substituted pyrrolidones. Different aniline derivatives with varying steric and electronic demands, aliphatic amines and benzyl amines were responsive to this methodology. The method was also modified for the synthesis of industrially important γ-valerolactone. Control experiments and
Regioselective Synthesis of γ-Amino Esters, Nitriles, Sulfones, and Pyrrolidinones by Nickel-Catalyzed Reductive Coupling of Aldimines and Activated Alkenes