Are there alternatives to 1H-Pyrrolo[3,2-b]pyridine-5-carboxylic acid (CAS: 872355-64-1) in synthesis?

Yes, there are several alternatives for synthesizing similar functional groups or substituents. For instance, isonicotinic acid and pyridine derivatives are often used as precursors. Additionally, other pyrrolo derivatives such as 1H-Pyrrolo[2,3-b]pyridine can serve as alternatives depending on the specific application. These alternatives can provide similar functionalities with varying synthetic approaches.