Stereocontrolled intermolecular radical additions to methylidenepiperazine-2,5-diones

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Abstract
The use of latent amino acid functionalities for the syntheses of methylidenepiperazine-2,5-diones is reported. These piperazinediones are potential chiral templates in the synthesis of functionalised piperazinediones and amino acids. Carbon–carbon bond formation utilising radical addition reactions between the methylidenepiperazinediones and a number of alkyl radicals resulted in good yields of the addition adduct. Moderate to high diastereoselectivities were observed and factors controlling the chiral induction are discussed here.

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