Ribonuclease T<sub>1</sub>Peptides. III. Synthesis of a Protected Heptapeptide Corresponding to Sequence 24–30
作者:Tetsuo Kato、Nobuo Mitsuyasu、Michinori Waki、Satoru Makisumi、Nobuo Izumiya
DOI:10.1246/bcsj.41.2480
日期:1968.10
A protected heptapeptide corresponding to sequence 24–30 of ribonuclease T1, namely benzyloxycarbonyl-O-benzyl-l-tyrosyl-l-glutaminyl-l-leucyl-l-histidyl-γ-t-butyl-l-glutamyl-β-t-butyl-l-aspartyl-glycine ethyl ester (XI), was synthesized by coupling of benzyloxycarbonyl-O-benzyl-l-tyrosyl-l-glutaminyl-l-leucine azide with a tetrapeptide ester, l-histidyl-γ-t-butyl-l-glutamyl-β-t-butyl-l-aspartyl-glycine ethyl ester, which is derived from Nα,Nim-dibenzyloxycarbonyl tetrapeptide ester by the catalytic hydrogenolysis. These tri- and tetrapeptide components were prepared with stepwise syntheses free from racemization.
通过将苄氧羰基-O-苄基-l-酪氨酰-l-谷氨酰胺酰-亮氨酸-组氨酰-γ-t-丁基-l-谷氨酰-β-t-丁基-天冬氨酰-甘氨酸乙酯与四肽酯-l-组氨酰-亮氨酸叠氮化物(XI)偶联,合成了与核糖核酸酶 T1 的序列 24-30 相对应的受保护七肽、是由苄氧羰基-O-苄基-l-酪氨酰-l-谷氨酰胺酰-亮氨酸叠氮化物与四肽酯-l-组氨酰-γ-t-丁基-l-谷氨酰-β-t-丁基-天冬氨酰-甘氨酸乙酯偶联合成的,后者是由 Nα,Nim-二苄氧羰基四肽酯经催化氢解而得。这些三肽和四肽成分是通过无外消旋的逐步合成法制备的。