A simple, large-scale synthesis of a cytokine, methionine-enkephalin, Tyr-Gly-Gly-Phe-Met, has been elaborated. Classical solution peptide chemistry methods without protection of amino acid side-chain functions and 1+(2+2) segment condensation were used. A nine-step synthesis from commercial amino acid derivatives was developed with yields ranging from 86% to 99%, averaging 92%. The purity of all intermediates was found to be 99.0-100% by HPLC. The process has been used to prepare greater than 150 g quantities of the pentapeptide as a monohydrate of 100% purity. Hydantoin formation was observed during saponification of Boc-Tyr-Gly-Gly-Phe-Met-OMe and minimised.
已详细阐述了一种细胞因子甲
硫氨酸-
脑啡肽(
酪氨酸-甘
氨酸-甘
氨酸-苯丙
氨酸-甲
硫氨酸,Tyr-Gly-Gly-Phe-Met)的简单大规模合成方法。利用经典的溶液肽
化学方法,无需保护
氨基酸侧链功能,采用1+(2+2)片段缩合技术。从商业
氨基酸衍
生物出发,设计了九步合成路线,产率范围为86%至99%,平均产率为92%。所有中间体的纯度通过HPLC检测,均达到99.0%至100%。该工艺已成功用于制备超过150克纯度为100%的五肽单
水合物。在Boc-Tyr-Gly-Gly-Phe-Met-OMe的皂化过程中观察到了乙内酰
脲的形成,并已最小化。