Preparation of theβ3-Homoselenocysteine Derivatives Fmoc-β3hSec(PMB)-OH and Boc-β3hSec(PMB)-OH for Solution and Solid-Phase-Peptide Synthesis and Selenoligation
作者:Oliver Flögel、Giulio Casi、Donald Hilvert、Dieter Seebach
DOI:10.1002/hlca.200790171
日期:2007.9
have been prepared from the corresponding α-amino acid derivative selenocystine (1) by the following sequence of steps: cleavage of the SeSe bond with NaBH4, p-methoxybenzyl (PMB) protection of the SeH group, Fmoc or Boc protection at the N-atom and Arndt–Eistert homologation (Schemes 1 and 2). A β3-heptapeptide 8 with an N-terminal β3-hSec(PMB) residue was synthesized on Rink amide AM resin and deprotected
通过以下步骤,由相应的α-氨基酸衍生物硒代胱氨酸(1)制备了标题化合物4和7:用NaBH 4裂解SeSe键,对SeH基的对甲氧基苄基(PMB)保护N原子和Arndt-Eistert同源性的Fmoc或Boc保护(方案1和2)。甲β 3 -heptapeptide 8与N-末端β 3 -hSec(PMB)的残余物上合成Rink酰胺AM树脂和脱保护(“在空气”),以得到相应的二硒化物9,这反过来,被加上了β 3 -tetrapeptide硫羟酸酯10由硒代结扎。将产物β 3 -undecapeptide被确定为它的二硒化物和其与苯硫酚混合selenosulfide(方案3)。讨论了α-和β- Sec衍生物之间的差异。