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.
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.