The Rearrangement Route to 2-Azabicyclo[2.1.1]hexanes. Solvent and Electrophile Control of Neighboring Group Participation
作者:Grant R. Krow、Guoliang Lin、Deepa Rapolu、Yuhong Fang、Walden S. Lester、Seth B. Herzon、Philip E. Sonnet
DOI:10.1021/jo034394z
日期:2003.6.1
0]hex-5-enes 5 with halonium ion electrophiles were studied in polar and nonpolar aprotic solvents and also in protic media with the aim of controlling nitrogen neighboring group participation. Specifically, for bromoniumions nitrogen participation is facilitated by the polar aprotic solvent nitromethane and by the poorly nucleophilic protic solvent acetic acid. Alkene 5b and bromine/nitromethane afford only
Synthesis and Unusual NMR-Spectroscopic Behavior of a Strained Bicyclic Ammonium Salt
作者:Stefan Pusch、Dieter Schollmeyer、Till Opatz
DOI:10.1002/ejoc.201701594
日期:2018.3.14
The first example of an 2‐azabicyclo[2.2.0]hexenium system is described. This strainedbicyclicammonium cation was characterized by NMR spectroscopy and XRD. The unusual coupling behavior and the strong πC=C→σ*C–N hyperconjugation were studied by DFT calculations.
描述了2-氮杂双环[2.2.0]]体系的第一个例子。通过NMR光谱和XRD表征该应变的双环铵阳离子。通过DFT计算研究了异常耦合行为和强πC = C →σ* C–N超共轭。