Transition metal-free iodine-promoted haloamination of unfunctionalized olefins
作者:Wei Li、Gong-Qing Liu、Bin Cui、Li Zhang、Ting-Ting Li、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1039/c4ra00383g
日期:——
A transition metal-free route to 3-halopiperidines and 2-halomethylpiperidines was described. In the presence of iodine, potassium persulfate and a suitable halogen source, intramolecular haloamination of 4-penten-1-amines and 5-hexen-1-amines proceeded readily, leading to the corresponding substituted piperidines in good isolated yields.
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
Regioselective Copper(II)-Mediated Bromoamination of Unfunctionalized Olefins: An Efficient Route to N-Heterocyclic Compounds
作者:Gong-Qing Liu、Zhen-Ying Ding、Li Zhang、Ting-Ting Li、Lin Li、Lili Duan、Yue-Ming Li
DOI:10.1002/adsc.201301125
日期:2014.7.7
Bromoamination of unfunctionalized olefins was realized under mild conditions using copper(II) bromide (CuBr2) as both reaction promoter and bromine source. The reactions could be carried out under open air at ambient temperature, and both N‐alkylated and N‐tosylated substrates could be converted to the corresponding N‐heterocyclic compounds in high regioselectivity and good isolated yields. A variety