intermolecular aminohalogenationreactions and a three-component aminoazidation reaction of unactivated alkenes with dialkylamino source were successively achieved in a remarkable regio- and stereoselective manner. These reactions were performed under neutral conditions and maintained excellent functional group tolerance toward a wide range of N-halodialkylamines and unactivated alkenes. Further mechanistic
In this research, we analyzed the alkylation mechanism of 3-chloropiperidnes by isolation of the proposed intermediate aziridiniumions and NMR kinetic investigations. The bicyclic structure of these predicted intermediates was confirmed by single crystal XRD, while the kinetic analysis revealed remarkable reactivity differences between the gem-methylated compounds and their corresponding non-methylated
A New Method for Intramolecular Chloroamination of Unfunctionalized Olefins
作者:Gong-Qing Liu、Wei Li、Yue-Ming Li
DOI:10.1002/adsc.201200352
日期:2013.1.25
A newmethod for the intramolecularchloroamination of unfunctionalizedolefins is reported. The reactions were carried out at room temperature for 3 h using hydrated copper(II) chloride as both promoter and chlorine source, and the corresponding vincinal haloamines were obtained in good isolated yields.
One-pot preparation of 3-chloropiperidine compounds via Cu(II)-promoted intramolecular chloroamination of unfunctionalized olefins
作者:Run-Lin Li、Gong-Qing Liu、Wei Li、Yu-Mei Wang、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1016/j.tet.2013.05.022
日期:2013.7
3-Chloropiperidine compounds were obtained via Cu(II)-promoted one-pot intramolecularchloroamination of N-benzyl-4-penten-1-amines and subsequent rearrangement. The reaction conditions leading to this skeleton were studied, and the structure of the product was confirmed by NMR as well as X-ray diffraction experiments.
The effective formation of 1-azabicyclo[3.1.0]hexane (5) by treatment of 2-(bromomethyl)pyrrolidine hydrobromide (4) with n-BuLi was established, with the reaction occurring by a rational reaction pathway via the open chain transition state 8 based on intermolecular Br...Li(+) coordination (SN2 process). The reaction of 5 with electrophiles 13a-n gave the corresponding pyrrolidines 14a-n and piperidine