How is 2,4-Dichloro-6-methylthieno[3,2-d]pyrimidine (CAS: 35265-82-8) typically synthesized?

2,4-Dichloro-6-methylthieno[3,2-d]pyrimidine can be synthesized via the condensation reaction of 2,4-dichloropyrimidine and thiophene in the presence of an appropriate catalyst, such as a base like potassium carbonate. The reaction typically yields a mixture that can be purified by recrystallization or column chromatography. The process requires careful temperature control and an inert atmosphere to prevent side reactions and impurities.