Abstract
Abstract Hydrogenation of linear ω-azido-pentafluorophenyl esters from mixed oligomers of 6-amino-6-deoxy- d -galactonic acid (or 6-amino-6-deoxy- d -mannonic acid) and 6-aminohexanoic acid gives cyclic peptides containing 14-, 28- and 42-membered ring lactams. Hydrogenation of a tetrameric peptide derived from e-amino acids gave a 28-membered ring lactam in 79% yield.
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