How is 2-Ethyl-1H-benzimidazole (CAS: 1848-84-6) typically synthesized?

2-Ethyl-1H-benzimidazole is typically synthesized by the condensation of ethylamine with 1H-benzimidazole. This reaction is usually conducted under mild conditions, often in the presence of a suitable catalyst such as an acid or base. The yield and selectivity can be optimized based on the choice of reagents and reaction conditions. Detailed synthesis protocols can be found in chemical literature.