Cyclopentanecarboxylic acid, 2-oxo-, methyl ester

Methyl 2-oxocyclopentanecarboxylate (the ester of cyclopentanecarboxylic acid, 2-oxo-) is a versatile building block in organic synthesis, mainly used as a starting material for pharmaceuticals (like prostaglandins), creating complex spirocyclic/fused-ring drug scaffolds, and in the development of novel materials, also serving as a chemical intermediate for fragrances and polymers due to its reactive β-keto ester structure.