Abstract
Chiral attachments on 2-oxoimidazolidine-4(S)-carboxylate ligands for dirhodium(ii) can provide differential diastereoselection in catalytic reactions of diazo compounds. The synthesis of these heterocyclic ligands from the readily available amino acid asparagine is reported. Reactions with diazoacetates offering intramolecular carbon—hydrogen insertion provide evaluative data that demonstrate differential diastereoselection. Surprisingly, placement of a carbonyl group within the chiral attachment removes enantiocontrol from the catalyst, presumably because of intramolecular ylide formation.
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Doyle, M.P., Timmons, D.J., Arndt, M.M.R. et al. First attempts at differential diastereoselection in catalytic reactions of N-chirally substituted dirhodium(ii) tetrakis[methyl 2-oxoimidazolidine-4(S)-carboxylates] with diazoacetates. Russian Chemical Bulletin 50, 2156–2161 (2001). https://doi.org/10.1023/A:1015061620557
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DOI: https://doi.org/10.1023/A:1015061620557