Fluoroalkyl-Substituted Diazomethanes and Their Application in a General Synthesis of Pyrazoles and Pyrazolines
作者:Lucas Mertens、Katharina J. Hock、Rene M. Koenigs
DOI:10.1002/chem.201601707
日期:2016.7.4
A novel continuous‐flow approach for the synthesis of fluoroalkyl‐substituted diazomethanes has been developed. Utilizing a cheap, self‐made microreactor fluoroalkyl‐substituted amines were transformed into the corresponding diazomethanes using tert‐butyl nitrite and acetic acid as catalyst. These diazomethanes were employed in [2+3] cycloaddition reactions with olefins and alkynes, yielding valuable
Enantioselective Synthesis of Fluoroalkyl-Substituted <i>syn</i>-Diamines by the Asymmetric <i>gem</i>-Difunctionalization of 2,2,2-Trifluorodiazoethane
作者:Jiuling Li、Dan Zhang、Jianghui Chen、Chaoqun Ma、Wenhao Hu
DOI:10.1021/acscatal.0c00972
日期:2020.4.17
We describe a facile strategy for building enantioenriched fluoroalkyl-substituted syn-diamines by the asymmetric gem-difunctionalization of 2,2,2-trifluorodiazoethane, which could be efficiently converted to a series of fluoroalkyl-substituted structures. The proposed keyintermediate is an ammonium ylide generated from 2,2,2-trifluorodiazoethane, and its reactivity was further explored by DFT calculations