An Efficient Synthesis of Nα-Protected Amino and Peptide Acid Aryl Amides via Iodine-Mediated Oxidative Acylation of Nα-Protected Amino and Peptide Thioacids
Chilakapati Madhu, T. M. Vishwanatha, Vommina V. Sureshbabu*
*#109, Peptide Research Laboratory, Department of Studies in Chemistry, Central College Campus, Bangalore University, Dr. B. R. Ambedkar Veedhi, Bangalore 560 001, India, Email: sureshbabuvomminarediffmail.com
C. Madhu, T. M. Vishwanatha, V. V. Sureshbabu, Synthesis, 2013, 45, 2727-2736.
DOI: 10.1055/s-0033-1339488 (free Supporting Information)
Thioacids derived from N-protected amino or polypeptide acids undergo facile N-acylation with aromatic amines to afford aryl amides in good to excellent yields and enantiopurities in the presence of iodine, 1-hydroxybenzotriazole and N,N-diisopropylethylamine at room temperature. This oxidative Nα-acylation also furnishes difficult-to-prepare N-Fmoc amino acid 4-nitroanilides in good yields.
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thioacids, acylation, amides, iodine