Enantioselective Synthesis of Protected <scp>l</scp>-4-[Sulfonamido(difluoromethyl)]phenylalanine and <scp>l</scp>-4-[Sulfonamido(methyl)]phenylalanine and an Examination of Hexa- and Tripeptide Platforms for Evaluating pTyr Mimics for PTP1B Inhibition
作者:Bryan Hill、Vanessa Ahmed、Daniel Bates、Scott D. Taylor
DOI:10.1021/jo061496r
日期:2006.10.1
These amino acids were incorporated into two peptide sequences, DADE-X-LNH2 and FmocGlu(OBn)-X-LNH2, which have previously been employed as platforms for assessing pTyr mimics for inhibition of protein tyrosine phosphatase 1B (PTP1B). Inhibition studies with these and other peptides and PTP1B revealed that good inhibition could be obtained using the tripeptide platform, although the presence of a pTyr
的第一对映选择性合成升-4-(sulfonamidomethyl)苯丙氨酸和升- [亚磺酰氨基(二氟甲基)]苯丙氨酸肽合成适当保护的描述。合成1-(磺酰胺基甲基)苯丙氨酸的关键步骤是在Ac - 1 -Phe(4-CH 2 SCOCH 3)-OEt上进行氧化氯化,得到粗制的Ac - 1 -Phe(4-CH 2 SO 2 Cl) -OEt,它可以与胺反应得到相应的磺酰胺。l准备的关键-[磺酰胺基(二氟甲基)]苯丙氨酸是高度对映选择性的反应,涉及威廉的助剂和苄基溴化物中间体。这些氨基酸被并入两个肽序列DADE-X-LNH 2和FmocGlu(OBn)-X-LNH 2,它们先前已用作评估pTyr模拟物对蛋白酪氨酸磷酸酶1B(PTP1B)抑制的平台。用这些肽和其他肽以及PTP1B进行的抑制研究表明,使用三肽平台可以获得良好的抑制作用,尽管良好抑制并不需要pTyr模拟物的存在。这些结果表明FmocGlu(OBn)-X-LNH