Synthesis of Protected 3,4- and 2,3-Dimercaptophenylalanines as Building Blocks for <i>Fmoc</i>-Peptide Synthesis and Incorporation of the 3,4-Analogue in a Decapeptide Using Solid-Phase Synthesis
作者:Isita Banerjee、Keshab Ch Ghosh、Emmanuel Oheix、Marion Jean、Jean-Valère Naubron、Marius Réglier、Olga Iranzo、Surajit Sinha
DOI:10.1021/acs.joc.0c02359
日期:2021.2.5
substitution of a protected aminomalonate on 3,4- and 2,3-dimercaptobenzyl bromide derivatives. The dithiol functions were protected as thioketals, and the key precursors, diphenylthioketal-protected dimercaptobenzyl bromides, were synthesized via two distinct routes from either dihydroxy benzoates or toluene-3,4-dithiol. Racemic mixtures of the fully protected amino acids were separated by chiral HPLC into
3,4-二巯基苯丙氨酸和2,3-二巯基苯丙氨酸是通过3,4-和2,3-二巯基苄基溴衍生物上受保护的氨基丙二酸酯的亲核取代首次合成的。二硫醇官能团被保护为硫缩酮,关键的前体,二苯硫基缩酮保护的二巯基苄基溴,是通过两条不同的路线由二羟基苯甲酸酯或甲苯3,4-二硫醇合成的。通过手性HPLC将完全保护的氨基酸的外消旋混合物分离成相应的对映异构体。可以基于X射线晶体学和VCD / DFT测量来分配3,4-和2,3-模拟的绝对构型。与氧化汞和四氟硼酸水溶液反应后,噻托金属基团脱保护,然后用H 2处理在氩气氛下用S气获得相应的二巯基氨基酸。使用标准的固相肽合成法将光学纯的1 - Fmoc保护的3,4-类似物(S-对映异构体)成功地掺入十肽中。因此,现在可以通过简单的合成方法获得二硫代烯官能化的肽,这将为催化,诊断和纳米技术领域的研究提供新的分子工具。