Selective Gold-Catalysed Synthesis of Cyanamides and 1-Substituted 1<i>H</i>
-Tetrazol-5-Amines from Isocyanides
作者:Karel Škoch、Ivana Císařová、Petr Štěpnička
DOI:10.1002/chem.201803252
日期:2018.9.18
The newly discovered gold‐catalysed reaction of isocyanides with hydrazoic acid generated in situ from trimethylsilyl azide and methanol (or, alternatively, from NaN3/AcOH) produces either cyanamides or 1‐substituted 1H‐tetrazol‐5‐amines, depending on the amount of available HN3. The reaction proceeds selectively and in generally high yields of either product, thus providing a particularly convenient
[3+1+1] type cyclization of ClCF<sub>2</sub>COONa for the assembly of imidazoles and tetrazoles <i>via in situ</i> generated isocyanides
作者:Ya Wang、Yao Zhou、Qiuling Song
DOI:10.1039/d0cc01919d
日期:——
A facile synthesis of imidazoles and tetrazoles via [3+1+1] type cyclization of ClCF2COONa is developed. A diverse array of imidazoles and tetrazoles were obtained in decent yields via isocyanide intermediates. Notably, this is the first example of the cycloaddition of in situ generated isocyanides.
Solvent-free and direct C(sp3)–H amination of adamantanes by grinding
作者:Zhen Wei、Jiarong Li、Ning Wang、Qi Zhang、Daxin Shi、Kening Sun
DOI:10.1016/j.tet.2014.01.014
日期:2014.2
A facile, direct and environmentally benign conversion of C(sp(3))-H bonds to C(sp(3))-N bonds using substoichiometric amount of aprotic superelectrophiles polyhalomethane-AIX(3) has been achieved by grinding under solvent-free conditions at room temperature in air. It is a general and simple method for the direct amination of adamantanes, and a series of aminoadamantanes of azoles, arylamines or heteroarylamines were obtained in good to excellent yields. The advantages of this amination are atom economy, solvent-free, chemoselectivity, short reaction time and high yields. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of New Functionally Substituted 1-R-tetrazoles and Their 5-Amino Derivatives
作者:S. V. Voitekhovich、A. N. Vorob'ev、P. N. Gaponik、O. A. Ivashkevich
DOI:10.1007/s10593-005-0267-4
日期:2005.8
Gonzalez; Alarcon; Cabildo, European Journal of Medicinal Chemistry, 1985, vol. 20, # 4, p. 359 - 362