1-Alkylpyrazoles and 1-alkyl-5-chloropyrazoles from halovinyl ketones and 1,1-dialkylhydrazines
摘要:
Regioselective heterocyclization of alkyl 2-chloro- and 2,2-dichlorovinyl ketones with 1,1-dialkylhydrazines to 1,3-dialkyl-1H-pyrazoles and 1,3-dialkyl-5-chloro-1H-pyrizoles involves intermediate formation of the corresponding dialkylhydrazones. Fragmentation pattern of chlorine-containing pyrazoles, 3-chloromethyl-1-methyl-1H-pyrazole and 5-chloro-1-methyl-3-propyl-1H-pyrazole, depends on the position of the halogen atom.
1-Alkylpyrazoles and 1-alkyl-5-chloropyrazoles from halovinyl ketones and 1,1-dialkylhydrazines
作者:G. V. Bozhenkov、V. A. Savosik、L. V. Klyba、E. R. Zhanchipova、A. N. Mirskova、G. G. Levkovskaya
DOI:10.1134/s1070428008080150
日期:2008.8
Regioselective heterocyclization of alkyl 2-chloro- and 2,2-dichlorovinyl ketones with 1,1-dialkylhydrazines to 1,3-dialkyl-1H-pyrazoles and 1,3-dialkyl-5-chloro-1H-pyrizoles involves intermediate formation of the corresponding dialkylhydrazones. Fragmentation pattern of chlorine-containing pyrazoles, 3-chloromethyl-1-methyl-1H-pyrazole and 5-chloro-1-methyl-3-propyl-1H-pyrazole, depends on the position of the halogen atom.