Alkylation and Reduction of N-Alkyl-4-nitroindazoles with Anhydrous SnCl2 in Ethanol: Synthesis of Novel 7-Ethoxy-N-alkylindazole Derivatives
摘要:
New series of indazoles substituted at the N-1 and N-2 positions and their 7-ethoxy derivatives have been synthesis starting from alkylation of 4-nitroindazole and reduction of alkyl-nitro-derivatives with anhydrous SnCl2 in ethanol. The structures of the products obtained were characterized using H-1 NMR, C-13 NMR, MS spectrometry and elemental analysis; the NMR spectroscopic data were used for structural assignment of the N-1 and N-2 isomers.
A Suitable Functionalization of Nitroindazoles with Triazolyl and Pyrazolyl Moieties via Cycloaddition Reactions
作者:Mohammed Eddahmi、Nuno M. M. Moura、Latifa Bouissane、Ouafa Amiri、M. Amparo F. Faustino、José A. S. Cavaleiro、Ricardo F. Mendes、Filipe A. A. Paz、Maria G. P. M. S. Neves、El Mostapha Rakib
DOI:10.3390/molecules25010126
日期:——
The alkylation of a series of nitroindazole derivatives with 1,2-dibromoethane afforded the corresponding N-(2-bromoethyl)- and N-vinyl-nitro-1H-indazoles. The Cu(I)-catalysed azide- alkyne 1,3-dipolar cycloaddition was selected to substitute the nitroindazole core with 1,4-disubstituted triazole units after converting one of the N-(2-bromoethyl)nitroindazoles into the corresponding azide. The reactivity