Osberger TJ, White MC. N-Boc amines to oxazolidinones via Pd(II)/bis-sulfoxide/Brønsted acid co-catalyzed allylic C-H oxidation.
J Am Chem Soc 2014;
136:11176-81. [PMID:
24999765 PMCID:
PMC4132963 DOI:
10.1021/ja506036q]
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Abstract
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A Pd(II)/bis-sulfoxide/Brønsted
acid catalyzed allylic C–H
oxidation reaction for the synthesis of oxazolidinones from simple N-Boc amines is reported. A range of oxazolidinones are
furnished in good yields (avg 63%) and excellent diastereoselectivities
(avg 15:1) to furnish products regioisomeric from those previously
obtained using allylic C–H amination reactions. Mechanistic
studies suggest the role of the phosphoric acid is to furnish a Pd(II)bis-sulfoxide
phosphate catalyst that promotes allylic C–H cleavage and π-allylPd
functionalization with a weak, aprotic oxygen nucleophile and to assist
in catalyst regeneration.
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