Davies SG, Garner AC, Ouzman JVA, Roberts PM, Smith AD, Snow EJ, Thomson JE, Tamayo JA, Vickers RJ. Diastereoselective synthesis of quaternary α-amino acids from diketopiperazine templates.
Org Biomol Chem 2007;
5:2138-47. [PMID:
17581658 DOI:
10.1039/b704475e]
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Abstract
Sequential enolate alkylations of (S)-N(1)-methyl-5-methoxy-6-isopropyl-3,6-dihydropyrazin-2-one and (S)-N(1)-p-methoxybenzyl-5-methoxy-6-isopropyl-3,6-dihydropyrazin-2-one proceed with excellent levels of diastereoselectivity (>90% de) affording quaternary alpha-amino acids in high enantiomeric excess (>98% ee) after deprotection and hydrolysis.
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