申请人:ELI LILLY AND COMPANY
公开号:EP0266897A1
公开(公告)日:1988-05-11
The present invention provides a process for preparing an alkylsulfinyl 2- phenylimidazo[4,5-c]pyridine of the formulae
or
wherein:
R¹ is hydrogen, C₁-C₄ alkyl, C₁-C₄ alkoxy, or halogen;
R³ is C₁-C₄ alkylsulfinyl in either the 2ʹ, 4ʹ, or 6ʹ position;
R² and R⁴ independently are hydrogen, hydroxy, halo, cyano, trifluoromethyl, C₁-C₄ alkyl, C₁-C₄ alkoxy, C₂-C₄ alkenyloxy, C₂-C₄ alkynyloxy, C₁-C₄ hydroxy-alkyloxy, cyanomethoxy, amino, mono- or di-C₁-C₄ alkylamino,
comprising reacting an N-(3-amino-4-pyridinyl)alkylthiobenzamide of the formula
wherein:
R¹, R² and R⁴ are as defined above; and
R⁵ is a C₁-C₄ alkylthio in either the 2ʹ, 4ʹ, or 6ʹ-position, with an oxidizing agent in a lower alkanoic acid solvent at a temperature of about -20°C to about 50°C.
本发明提供了一种制备 2-苯基咪唑并[4,5-c]吡啶的烷基亚磺酰基的工艺,其式为
或
其中
R¹ 是氢、C₁-C₄ 烷基、C₁-C₄ 烷氧基或卤素;
R³ 是位于 2ʹ、4ʹ或 6ʹ位的 C₁-C₄烷基亚磺酰基;
R² 和 R⁴ 分别为氢、羟基、卤代、氰基、三氟甲基、C₁-C₄ 烷基、C₁-C₄ 烷氧基、C₂-C₄烯氧基、C₂-C₄炔氧基、C₁-C₄羟基烷氧基、氰基甲氧基、氨基、单-或双-C₁-C₄烷基氨基、
包括使 N-(3-氨基-4-吡啶基)烷基硫代苯甲酰胺反应,其式为
其中
R¹、R² 和 R⁴ 如上定义;和
R⁵是2ʹ、4ʹ或6ʹ位的C₁-C₄烷硫基,在低级烷酸溶剂中与氧化剂在约-20℃至约50℃的温度下反应。