Synthesis of (2S,4S)- and (2S,4R)-5-fluoroleucine and (2S,4S)-[5,5-2H2]-5-fluoroleucine
作者:Jean-Damien Charrier、David S. Hadfield、Peter B. Hitchcock、Douglas W. Young
DOI:10.1039/b314933a
日期:——
Syntheses of (2S,4S)- and (2S,4R)-5-fluoroleucine, 1a and 2, and of (2S,4S)-[5,5-2H2]-5-fluoroleucine, 1b, have been completed. The methodology allows these compounds to be prepared in sufficient quantities for incorporation by solid-state protein synthesis into strategic sites in proteins for folding studies. X-ray structures of the epimers 1a and 2 have been obtained and show the presence of conformational isomerism. The torsion angles between the F–C bond and the main chain are compared with values found in a mutant of the protein ubiquitin in which (2S,4S)-5-fluoroleucine replaces leucine residues 50 and 67 in the native protein.
(2S,4S)-和(2S,4R)-5-氟亮氨酸 1a 和 2,以及(2S,4S)-[5,5-2H2]-5-氟亮氨酸 1b 的合成已经完成。这种方法可以制备出足够数量的这些化合物,通过固态蛋白质合成将其加入蛋白质中的重要部位进行折叠研究。外延物 1a 和 2 的 X 射线结构已经获得,并显示出构象异构的存在。F-C 键与主链之间的扭转角与泛素蛋白突变体中发现的值进行了比较,在突变体中,(2S,4S)-5-氟亮氨酸取代了原生蛋白中亮氨酸残基 50 和 67。