Metal-free synthesis of pyridin-2-yl ureas from 2-aminopyridinium salts
作者:Saroj、Om P.S. Patel、Krishnan Rangan、Anil Kumar
DOI:10.1016/j.tetlet.2019.07.030
日期:2019.8
domino approach has been developed for the synthesis of pyridin-2-yl urea derivatives via the reaction of 2-aminopyridinium salts and arylamines. The developed strategy tolerated a wide range of functional groups and afforded pyridin-2-yl ureas in moderate to good yields. The reaction was postulated to involve tandem cyclization, intermolecular nucleophilic addition, ring opening, and demethylation.
Conformer independent heterodimerisation of linear arrays using three hydrogen bonds
作者:Andrea M. McGhee、Colin Kilner、Andrew J. Wilson
DOI:10.1039/b712603d
日期:——
5-Membered heterocycles are employed to give a conformer independent DDA array of hydrogen bonds, resulting in enhanced binding affinity to a complementary AAD array in comparison to a DDA array employing a 6-membered ring.
“Urea to Urea” Approach: Access to Unsymmetrical Ureas Bearing Pyridyl Substituents
作者:Svetlana O. Kasatkina、Kirill K. Geyl、Sergey V. Baykov、Mikhail S. Novikov、Vadim P. Boyarskiy
DOI:10.1002/adsc.202101490
日期:2022.3.30
A protocol for the synthesis of unsymmetrical ureas substituted by pyridyl/quinolinyl moiety has been developed. This method concluded in metal- and base-free reamination of N,N-dimethyl-N‘-hetaryl ureas with a wide range of aryl and alkyl amines. The isolated yields vary from 40 to 96% depending on the nucleophilicity of the amines. The scope of this method includes more than 50 examples. The reaction
Molecular conformation of 1,3-pyridylphenylureas by 1H and 13C NMR study
作者:L.V. Sudha、D.N. Sathyanarayana
DOI:10.1016/0022-2860(85)85108-5
日期:1985.10
1H and 13CNMR spectra are reported for several 1,3-pyridylphenyl ureas. Analysis of the spectra yielded the chemical shifts. The variations in the chemical shifts have been discussed in terms of the molecular conformations.
报告了几种 1,3-吡啶基苯基脲的 1 H 和 13 C NMR 光谱。光谱分析产生化学位移。已经根据分子构象讨论了化学位移的变化。
VASSILEV G. N.; NICOLOV N. N., DOKL. BOLG. AN, 1980, 33, HO 8, 1127-1130