Fluorinated heterocyclic compounds: Selective chlorine/fluorine exchange reactions on pyrimidines
作者:E. Klauke、L. Oehlmann、B. Baasner
DOI:10.1016/s0022-1139(00)81461-x
日期:1982.12
methyl group, and SbF3 only in the chlorinated methyl group. In the first stage of fluorination with NaF only chlorine bound in position 4 of the pyrimidine ring is exchanged. The HF reaction is an equilibrium reaction in which the substitution of the fluorine for the first chlorine atom occurs preferentially in position 2. The behaviour of partly fluorinated pyrimidines in nucleophilic exchange reactions
描述了在四氯嘧啶,6-甲基-,6-氯甲基-,6-二氯甲基-和6-三氯甲基-2,4,5-三氯嘧啶上的选择性氯/氟交换反应。氟化钠,氟化钾,氟化氢和三氟化锑被用作氟化剂。发现NaF和KF仅在杂环原子核中氟化,在原子核和氯化甲基中为HF,而SbF 3为氟化物。仅在氯化甲基中。在用NaF氟化的第一阶段中,仅交换结合在嘧啶环的4位上的氯。HF反应是平衡反应,其中氟优先取代在第2位上的第一个氯原子。还讨论了部分氟化嘧啶在亲核交换反应中的行为。