A one-pot, three-component cascade reaction combining photoredox catalyzed radical addition and formal [3 + 2] annulation was developed. With this approach, highly concise syntheses of imidazoline and oxazolidine derivatives have been achieved. The advantages of this transformation are good to excellent yields, mild reaction conditions, operational simplicity, and easy accessibility of raw materials
Synthesis of substituted imidazolines via [3+2]-cycloaddition of aziridines with nitriles
作者:B.A.Bhanu Prasad、Ghanshyam Pandey、Vinod K Singh
DOI:10.1016/j.tetlet.2003.12.015
日期:2004.2
An efficient synthesis of 2,4-disubstituted 1H-imidazolines from aziridines and nitriles in the presence of BF3-E(2)tO or triethyloxonium tetrafluoroborate has been described. The reaction proceeds via a [3+2]-cycloaddition reaction. Most of the nitriles successfully underwent cycloaddition reactions with aziridines even at room temperature in a very short time. (C) 2003 Elsevier Ltd. All rights reserved.
Studies on the Reaction of Aziridines with Nitriles and Carbonyls: Synthesis of Imidazolines and Oxazolidines
作者:Shikha Gandhi、Alakesh Bisai、B. A. Bhanu Prasad、Vinod K. Singh
DOI:10.1021/jo062564c
日期:2007.3.1
presence of molecular sieves. Among various triflates, Zn(OTf)2 has been found to be the best. The cleavage of the N-Ts bond of the cyclized products has been studied in order to make it more versatile in synthesis. The mechanistic aspect of the reaction has been studied by using chiral aziridines as substrates. These formal [3 + 2] cycloaddition reactions of aziridines with nitriles and carbonyls proceed