K⋅⋅⋅F intramolecular chelation: Glycinates with fluorine‐containing substituents on the nitrogen atom were found to be potent substrates for the present diastereoselectivealkylation. Alkylation occurred by way of the corresponding enolate, which possessed a rigid bicyclo [3.3.0] structure. A fluorine atom on the enolate played a pivotal role by constructing an intramolecularinteraction with a potassium