4-(3-溴苯基)-2,4-二氧代丁酸甲酯 、
甲基肼 在
ethyl acetate hydrochloride 、
氯化钠 、
Sodium sulfate-III 、 crude product 、 SiO2 、 ethyl acetate heptane 、 ethyl ester 、 methyl ester 、 Br 作用下,
以
乙醇 为溶剂,
反应 5.0h,
以to give 1.64 g (37%) of 5-(3-bromo-phenyl)-2-methyl-2H-pyrazole-3-carboxylic acid methyl ester (and ethyl ester) as white powder (MS: methyl ester 295.1 MH+, 1 Br; ethyl ester 309.1 MH+, 1 Br) and 1.11 g (28%) of 5-(3-bromo-phenyl)-1-methyl-1H-pyrazole-3-carboxylic acid methyl ester (and ethyl ester) as yellow oil (MS: methyl ester 295.1 MH+, 1 Br; ethyl ester 309.1 MH+, 1 Br)的产率得到methyl 3-(3-bromophenyl)-1-methyl-1H-pyrazole-5-carboxylate