Abstract
Abstract For the purpose of synthesis of antibiotic bacitracin of six amino acids-membered ring formula, the following intermediate peptides, i.e., cyclo-(Nα-benzy]oxycarbonyl-l-lysyl-Nδ-cyclopentyloxycarbonyl-d-ornithyl-l-isojeucyl-d-phenylalanyl-l-histidyl-α-methyl-l-aspartyl) (III) and Nα-benzyloxycarbonyl-Nε-t-butyloxycarbonyl-l-lysyl-Nδ-cyclopentyloxycarbonyl-d-ornithyl-l-isoleucyl-d-phenylalanyl-Nim-benzyl-l-histidyl-l-aspartyl-d-isoasparagine benzyl ester (IV) were prepared. In this synthesis, cyclopentyloxycarbonyl group was introduced to protect δ-amino group of ornithine residue and cleavability of this protecting group for hydrogen fluoride was investigated.
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