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.
为了合成具有六个
氨基酸成员环结构的抗生素巴西霉素,制备了以下中间肽,即环状(Nα-苄氧羰基-l-赖
氨酸-Nδ-环戊基氧羰基-d-
鸟氨酸-l-
异亮氨酸-d-苯丙
氨酸-l-组
氨酸-α-甲基-l-
天冬氨酸)(III)和Nα-苄氧羰基-Nε-t-丁氧羰基-l-赖
氨酸-Nδ-环戊基氧羰基-d-
鸟氨酸-l-
异亮氨酸-d-苯丙
氨酸-Nim-苄基-l-组
氨酸-l-
天冬氨酸-d-异
天冬氨酸苄酯(IV)。在此合成中,引入了环戊基氧羰基基团以保护
鸟氨酸残基的δ-
氨基基团,并研究了该保护基团在
氟化氢作用下的可裂解性。