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Polyleucine-based systems have been shown to catalyse the asymmetric epoxidation of a variety of enones, an enynone, selected enediones and an unsaturated ketoester.

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Addition of methyllithium followed by tertiary haloalkanes to readily available and air-stable (methyl 2-acetamidoacrylate)tricarbonyliron(0) 1, gives protected (3,(3,(3-trialkyl a-amino acids which are hydrolysed to give tert-leucine 10 and the new a-amino acids 2-amino-3,3-dimethylpentanoic acid 11 and 2-amino-3,3-dimethylhexanoic acid 12.