申请人:Nihon Nohyaku Co., Ltd.
公开号:EP1277726A1
公开(公告)日:2003-01-22
The present invention provides a process for producing 2-halobenzoic acids of the general formula (I), characterized by reacting a benzoic acid of formula (II) with a halogenating agent in the presence of Pd catalyst:
(wherein A is -OH, -OM (M is alkali metal), -N(R6)R7 (R6 and R7 are each H, C1-C6 alkyl, optionally substituted phenyl, or the like); R is H, C1-C6 alkyl, C1-C6 alkylcarbonyl, carboxyl, C1-C12 alkoxycarbonyl, optionally substituted phenylcarbonyl, or the like; n is 0 to 4; X is Cl, Br or I, or alternatively (R)n may be present on benzene-constituting carbon atoms adjacent to each other and form a C3-C4 alkylene- or C3-C4 alkenylene-fused ring).
本发明提供了一种生产通式(I)的2-卤代苯甲酸的工艺,其特征在于在钯催化剂存在下,使式(II)的苯甲酸与卤化剂反应:
(其中 A 为-OH、-OM(M 为碱金属)、-N(R6)R7(R6 和 R7 各为 H、C1-C6 烷基、任选取代的苯基或类似物);R 为 H、C1-C6 烷基、C1-C6 烷基羰基、羧基、C1-C12 烷氧基羰基、任选取代的苯基羰基或类似物;n 为 0 至 4;X 为 Cl、Br 或 I,或者 (R)n 可以存在于彼此相邻的苯构成碳原子上,并形成 C3-C4 亚烷基或 C3-C4 亚烯基融合环)。