申请人:The Procter & Gamble Co.
公开号:US06348624B1
公开(公告)日:2002-02-19
The subject invention involves processes for making 2,4-difluoro-3-Q1-benzoic acid, wherein Q1 is derived from an electrophilic reagent, comprising the steps of: (a) treating 1-bromo-2,4-difluorobenzene with a strong, non-nucleophilic base; then treating with an electrophilic reagent which provides Q1, or a functional moiety which is then transformed to Q1, producing 1-bromo-2,4-difluoro-3-Q1-benzene; (b) treating the 1-bromo-2,4-difluoro-3-Q1-benzene with an alkali or alkaline earth metal or organometallic reagent; then treating with carbon dioxide, or with a formylating agent followed by oxidation, to produce 2,4-difluoro-3-Q1-benzoic acid.
The subject invention also involves optional additional steps to further modify Q1, or to substitute a non-hydrogen moiety at the 5-position, at the 6-position, or at both, of the phenyl ring of the 2,4-difluoro-3-Q1-benzoic acid.
该主题发明涉及制备2,4-二氟-3-Q1-苯甲酸的过程,其中Q1来源于亲电试剂,包括以下步骤:(a) 用强的非亲核碱处理1-溴-2,4-二氟苯;然后用提供Q1的亲电试剂处理,或者处理一个随后转化为Q1的功能基团,生成1-溴-2,4-二氟-3-Q1-苯;(b) 用碱金属或碱土金属或有机金属试剂处理1-溴-2,4-二氟-3-Q1-苯;然后用二氧化碳处理,或者用一种甲酰化试剂后进行氧化,生成2,4-二氟-3-Q1-苯甲酸。该主题发明还涉及可选的额外步骤,以进一步修改Q1,或者在2,4-二氟-3-Q1-苯甲酸的苯环的5位、6位或两者位置上替换一个非氢基团。