Are there alternatives to 2-Methyl-L-proline (CAS: 42856-71-3) in synthesis?

While 2-Methyl-L-proline is a useful proline derivative, there are alternative proline analogs such as L-proline itself or other cyclic amino acids that can be used in synthesis. Other common alternatives include D-proline or substituted prolines, which may offer similar functionality with different reactivity profiles. The choice depends on the specific reaction conditions and desired properties of the final product.