Two derivatives of 1,5-disubstituted tetrazoles: 1-(4-nitrophenyl)-1H-tetrazol-5-amine and {(E)-[1-(4-ethoxyphenyl)-1H-tetrazol-5-yl]iminomethyl}dimethylamine
摘要:
The geometric features of 1-(4-nitrophenyl)-1H-tetrazol-5-amine, C7H6N6O2, correspond to the presence of the essential interaction of the 5-amino group lone pair with the pi system of the tetrazole ring. Intermolecular N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds result in the formation of infinite chains running along the [110] direction and involve centrosymmetric ring structures with motifs R-2(2)(8) and R-2(2)(20). Molecules of {(E)-[1-(4-ethoxyphenyl)-1H-tetrazol-5-yl]iminomethyl}-dimethylamine, C12H16N6O, are essentially flattened, which facilitates the formation of a conjugated system spanning the whole molecule. Conjugation in the azomethine N C -N fragment results in practically the same length for the formal double and single bonds.
A novel facile route for the introduction of 5-amino and 5-alkylamino substituents into 1-aryltetrazoles has been developed. A range of 5-amino-1-aryltetrazoles was obtained directly from the corresponding 1-aryltetrazoles in one pot by consecutive ring-opening, azidation and intramolecular cyclization. 5-Alkylamino-1-aryltetrazoles were formed by a similar mechanism from 1,4-disubstituted tetrazolium salts. An influence of the nature of aryl substituents and reaction conditions on the regioselectivity of the intramolecular cyclization of intermediate guanyl azides is revealed.
Schelenz, Thomas; Schaefer, Wieland, Advanced Synthesis and Catalysis, 2000, vol. 342, # 2, p. 197 - 200
作者:Schelenz, Thomas、Schaefer, Wieland
DOI:——
日期:——
Stolle et al., Journal fur praktische Chemie (Leipzig 1954), 1932, vol. <2>134, p. 282,297
作者:Stolle et al.
DOI:——
日期:——
Two derivatives of 1,5-disubstituted tetrazoles: 1-(4-nitrophenyl)-1<i>H</i>-tetrazol-5-amine and {(<i>E</i>)-[1-(4-ethoxyphenyl)-1<i>H</i>-tetrazol-5-yl]iminomethyl}dimethylamine
作者:Alexander S. Lyakhov、Andrey N. Vorobiov、Ludmila S. Ivashkevich、Pavel N. Gaponik
DOI:10.1107/s0108270108019707
日期:2008.8.15
The geometric features of 1-(4-nitrophenyl)-1H-tetrazol-5-amine, C7H6N6O2, correspond to the presence of the essential interaction of the 5-amino group lone pair with the pi system of the tetrazole ring. Intermolecular N-H center dot center dot center dot N and N-H center dot center dot center dot O hydrogen bonds result in the formation of infinite chains running along the [110] direction and involve centrosymmetric ring structures with motifs R-2(2)(8) and R-2(2)(20). Molecules of (E)-[1-(4-ethoxyphenyl)-1H-tetrazol-5-yl]iminomethyl}-dimethylamine, C12H16N6O, are essentially flattened, which facilitates the formation of a conjugated system spanning the whole molecule. Conjugation in the azomethine N C -N fragment results in practically the same length for the formal double and single bonds.