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The base-catalyzed acyl transfer (Baker–Venkataraman reaction) of chiral 2-acetyl-1-hydroxyanthraquionone esters 6 of 2-methylbutanoic acid or 11 of O-allyl lactic acid proceeds with virtually no racemization to ketides 7 and 12. The subsequent acid-catalyzed cyclization to the chiral anthra[1,2-b]pyran antibiotics such as (S)-1″-11-dideoxyespicufolin 8 or 13 also occurs with a very low racemization.
Publications
Selenocysteine containing peptoids and peptide–peptoid conjugates were synthesized by combinatorial Ugi-MCRs (multicomponent reactions) in water: for the first time, an acetal (selenoacetal 2a) was used in Ugi-MCR to furnish selenocysteine peptoids in one step as model compounds for selenocysteinepeptides and proteins.