A Regioselective Synthesis of 5-chloro-1-vinyl- and 3-alkenyl-5-chloro-1H-pyrazoles
作者:Valentina А. Kobelevskaya、Ludmila I. Larina、Alexandr V. Popov
DOI:10.1007/s10593-022-03139-x
日期:2022.11
5-Chloro-1-vinyl-1Н-pyrazoles were obtained by elimination of hydrogen chloride from the corresponding 5-chloro-1-(2-chloroethyl)-1Н-pyrazoles by the action of NaOH in EtOH or t-BuOK in pyridine. The synthesis of 5-chloro-3-propyl-1-vinyl-1H-pyrazole-4-carbaldehyde was carried out by the treatment of 5-chloro-1-(2-chloroethyl)-3-propyl-1H-pyrazole-4-carbaldehyde with t-BuOK in pyridine. 3-Alkenyl-5-chl