Selective fluorination of ethyl 1-methylpyrazole-4-carboxylates with poly(hydrogen fluoride)-amine complex under electrolytic anodic oxidation
作者:Kenzi Makino、Hirosuke Yoshioka
DOI:10.1016/s0022-1139(00)81615-2
日期:1988.6
Fluorination of ethyl 1-methylpyrazole-4-carboxylate (1a) and its 3-chloro analogue (1b) with poly(hydrogen fluoride)-pyridine-triethylamine complex under electrolytic anodic oxidation yielded new ethyl 1-methyl-5-fluoropyrazole-4-carboxylate (2a), ethyl 1-fluoromethyl-5-fluoropyrazole-4-carboxylate (3a) and their 3-chloro analogues (2b) and (3b). Major factors controlling selectivities and yields
在电解阳极氧化条件下,用聚氟化氢-吡啶-三乙胺络合物氟化1-甲基吡唑-4-羧酸乙酯(1a)及其3-氯类似物(1b),得到新的乙基1-甲基-5-氟吡唑-4-羧酸盐(2a),1-氟甲基-5-氟吡唑-4-羧酸乙酯(3a)及其3-氯类似物(2b)和(3b)。描述了控制氟化吡唑-4-羧酸盐的选择性和收率的主要因素。