Are there alternatives to 6-Bromo-4-chloro-1H-pyrrolo[2,3-d]pyrimidine in synthesis?

There are several alternatives to 6-Bromo-4-chloro-1H-pyrrolo[2,3-d]pyrimidine (CAS: 784150-41-0) in synthesis, such as 6-Chloro-4-chloro-1H-pyrrolo[2,3-d]pyrimidine and 6-Fluoro-4-chloro-1H-pyrrolo[2,3-d]pyrimidine. These analogs can be used as substitutes depending on the specific requirements and reactivity of the target molecule. Common alternative reagents include various halides, which can be used to modify the molecular structure to suit different synthetic routes.