Novel synthesis of various orthogonally protected Cα-methyllysine analogues and biological evaluation of a Vapreotide analogue containing (S)-α-methyllysine
作者:Souvik Banerjee、Walker J. Wiggins、Jessie L. Geoghegan、Catherine T. Anthony、Eugene A. Woltering、Douglas S. Masterson
DOI:10.1039/c3ob41282b
日期:——
2-methyllysine analogues, and a (S)-β2,2-methyllysine analogue from a common synthon by straightforward manipulation of protecting groups. Two different straightforward and cost effective synthetic strategies are described for the synthesis of α2,2-methyllysine analogues. The described strategies should find significant usefulness in preparing novel peptide libraries with unnatural lysine analogues. A Vapreotide
含有季碳中心的前手性的二酯丙二酸已成功地转化为一组不同的吨的Boc-的Fmoc-α 2,2通过获得手性丙二酸半酯的中间体-methyllysine-OH类似物通过酶促(猪肝酯酶,PLE)水解。侧链中1至6个亚甲基单元之间不等的各种手性半酯中间体可实现中等至高的光学纯度,并具有良好的收率。根据所得手性半酯的立体化学构型,具有各种侧链长度的丙二酸二酯的PLE水解似乎遵循琼斯的PLE模型。既定的合成策略允许α的两种对映体的结构2,2-methyllysine类似物,和(小号)-β 2,2- -methyllysine类似物从由保护基团的简单的操作共同的合成子。两个不同的简单且成本有效的合成策略是为α的合成所述2,2- -methyllysine类似物。所描述的策略应在制备具有非天然成分的新型肽文库中发挥重要作用赖氨酸类似物。阿伐普肽类似物掺入(小号)-α 2,2- -methyllysine制备