An industrial process for producing a 2-substituted benzo[b]thiophene which is highly effective in that it can afford the target compound in a high yield with a simple operation without the necessity for using unstable starting materials. The process comprises reacting an optionally substituted 2-halogenobenzaldehyde with either a compound represented by the general formula (1): HiSjMk (wherein M represents an alkali metal atom; i represents an integer of 0 or 1; j represents an integer of 1 or above; and k represents an integer of 1 or 2; provided i + k = 2 ) and sulfur, or a compound represented by the above formula (1) (wherein j is 2 or above) in the presence of an aprotic polar solvent, and then reacting the reaction product with a compound represented by the general formula (2): XCH₂R (wherein X represents a halogen atom; and R represents acyl, optionally substituted alkoxycarbonyl, optionally substituted arylcarbonyl, or cyano) to effect intramolecular ring closure.
一种生产 2-取代苯并[b]
噻吩的工业工艺,其高效之处在于操作简单,无需使用不稳定的起始原料,即可高产获得目标化合物。该工艺包括将任选取代的 2-卤代
苯甲醛与通式(1)所代表的化合物反应:HiSjMk(其中 M 代表碱
金属原子;i 代表 0 或 1 的整数;j 代表 1 或以上的整数;k 代表 1 或 2 的整数;条件是 i + k = 2 )和
硫,或由上式 (1) 代表的化合物(其中 j 为 2 或以上)在钝极性溶剂存在下反应,然后将反应产物与由通式 (2) 代表的化合物反应:XCH₂R(其中 X 代表卤素原子;R 代表酰基、任选取代的烷氧羰基、任选取代的芳基羰基或
氰基),以实现分子内环闭合。