Process for preparing benzoic acid derivative intermediates and benzothiophene pharmaceutical agents
申请人:ELI LILLY AND COMPANY
公开号:EP0699673A1
公开(公告)日:1996-03-06
The present invention provides a novel process for preparing a compound of formula I
wherein
R is C₁-C₄ alkyl;
R¹ and R each are independently C₁-C₄ alkyl, or combine to form piperidinyl, pyrrolidinyl, methylpyrrolidino, dimethylpyrrolidino, morpholino, dimethylamino, diethylamino, or 1-hexamethyleneimino; and
n is 2 or 3;
or a pharmaceutically acceptable salt thereof, comprising
a) condensing (C₁-C₄ alkyl) 4-hydroxybenzoate with ethylene carbonate or propylene carbonate in the presence of a condensation catalyst and a moderately polar, water immiscible solvent having a high boiling point;
b) reacting the product of step a), a compound of formula III
wherein
R and n are as defined above, with a leaving group donor; and
c) reacting the product of step b), a compound of formula IV
wherein
R and n are as defined above and
X is a leaving group, with a base selected from the group consisting of piperidine, pyrrolidine, methylpyrrolidine, dimethylpyrrolidine, morpholine, dimethylamine, diethylamine, and 1-hexamethyleneimine.
The product of the above process, a compound of formula I, also is novel and is useful for the preparation of pharmaceutically active compounds of formula II, particularly via the following novel process
wherein
R is C₁-C₄ alkyl;
R¹ and R each are independently C₁-C₄ alkyl, or combine to form piperidinyl, pyrrolidinyl, methylpyrrolidino, dimethylpyrrolidino, morpholino, dimethylamino, diethylamino, or 1-hexamethyleneimino; and
n is 2 or 3;
or a pharmaceutically acceptable salt thereof, comprising
a) condensing (C₁-C₄ alkyl) 4-hydroxybenzoate with ethylene carbonate or propylene carbonate in the presence of a condensation catalyst and a moderately polar, water immiscible solvent having a high boiling point;
b) reacting the product of step a), a compound of formula III
wherein
R and n are as defined above, with a leaving group donor;
c) reacting the product of step b), a compound of formula IV
wherein
R and n are as defined above; and
X is a leaving group, with a base selected from the group consisting of piperidine, pyrrolidine, methylpyrrolidine, dimethylpyrrolidine, morpholine, dimethylamine, diethylamine, and 1-hexamethyleneimine;
d) reacting the product of step c) with a compound of formula IV wherein R³ and R⁴ are as defined above, or a pharmaceutically acceptable salt thereof;
e) optionally removing the reaction product from step d) ; and
f) optionally forming a salt of the reaction product from either step d) or step e).
本发明提供了一种制备式 I 化合物的新工艺
其中
R 是 C₁-C₄ 烷基;
R¹ 和 R 各自独立地为 C₁-C₄ 烷基,或结合形成哌啶基、吡咯烷基、甲基吡咯烷基、二甲基吡咯烷基、吗啉基、二甲基氨基、二乙基氨基或 1- 六亚甲基亚氨基;以及
n 为 2 或 3;
或其药学上可接受的盐,包括
a) 在缩合催化剂和具有高沸点的中等极性、不溶于水的溶剂存在下,使(C₁-C₄ 烷基)4-羟基苯甲酸酯与碳酸乙烯酯或碳酸丙烯酯缩合;
b) 将步骤 a) 的产物与式 III 的化合物反应
其中
R 和 n 如上定义,与离去基团供体反应;以及
c) 将步骤 b) 的产物,即式 IV 的化合物,与离去基团供体反应
其中
R 和 n 如上文所定义,且
X 是离去基团,与选自哌啶、吡咯烷、甲基吡咯烷、二甲基吡咯烷、吗啉、二甲胺、二乙胺和 1-六亚甲基亚胺组成的组的碱反应。
上述工艺的产物,即式 I 化合物,也是一种新型化合物,可用于制备具有药用活性的式 II 化合物,特别是通过以下新型工艺制备
其中
R 是 C₁-C₄ 烷基;
R¹ 和 R 各自独立地为 C₁-C₄ 烷基,或结合形成哌啶基、吡咯烷基、甲基吡咯烷基、二甲基吡咯烷基、吗啉基、二甲基氨基、二乙基氨基或 1- 六亚甲基亚氨基;以及
n 为 2 或 3;
或其药学上可接受的盐,包括
a) 在缩合催化剂和具有高沸点的中等极性、不溶于水的溶剂存在下,使(C₁-C₄ 烷基)4-羟基苯甲酸酯与碳酸乙烯酯或碳酸丙烯酯缩合;
b) 将步骤 a) 的产物与式 III 的化合物反应
其中
R 和 n 如上定义,与离去基团供体反应;
c) 将步骤 b) 的产物--式 IV 的化合物--与离去基团供体反应
其中
R 和 n 如上定义;和
X 是离去基团,与选自哌啶、吡咯烷、甲基吡咯烷、二甲基吡咯烷、吗啉、二甲胺、二乙胺和 1-六亚甲基亚胺组成的组的碱反应;
d) 将步骤 c) 的产物与式 IV 的化合物(其中 R³ 和 R⁴ 如上文所定义)或其药学上可接受的盐反应;
e) 从步骤 d) 中选择性地去除反应产物;以及
f) 选择性地将步骤 d) 或步骤 e) 的反应产物形成盐。