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American Chemical Society, Journal of Organic Chemistry, 6(68), p. 2528-2528, 2003

DOI: 10.1021/jo039926q

American Chemical Society, Journal of Organic Chemistry, 18(67), p. 6372-6375, 2002

DOI: 10.1021/jo020280w

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Amino Acid Bromides: Their N-Protection and Use in the Synthesis of Peptides with Extremely Difficult Sequences

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

N(alpha)-Protected alpha-amino acid bromides were easily generated in situ with 1-bromo-N,N-2-trimethyl-1-propenylamine from the corresponding amino acids under very mild conditions. o-Nbs and the azido moieties proved to be compatible with these overactivated halides and were successfully applied in difficult peptide bond formations. N-Deprotection methods and the total step-by-step solution synthesis of a peptide containing up to seven consecutive L-(alphaMe)Valine residues are also reported. The assembly of this homopeptide was achieved in a short time and in very high yields by the azido/bromide system in a single repetitive operation.