A Silaproline-Containing Dipeptide.

The silaproline-containing dipeptide N-(3,3-di­methyl-1-pivaloyl-1-aza-3-sila-5-cyclo­pentyl­carbonyl)-l-alanine iso­propyl­amide, C17H33N3O3Si, has two independent molecules in the asymmetric unit and each adopts a β-II folded conformation, where the amide on the terminal C interacts intramolecularly with the pivaloyl O atom. The five-membered silaproline ring is Cβ-puckered, an infrequent conformation for the homol­ogous proline ring.