Boc-phosphoamino acid derivatives with O-[di(4-nitrobenzyl)- or dicyclohexylphosphono]-protection were prepared for application to the Boc-mode solid-phase synthesis of phosphopeptides. These protecting groups are both stable to TFA, but removable with a combination of trifluoromethanesulfonic acid and methylthiobenzene in TFA. Of these derivatives, Nα-Boc-O-(dicyclohexylphosphono)serine and Nα-Boc-O-(dicyclohexylphosphono)threonine were obtained as crystalline compounds to be favorably utilized as starting materials for solid-phase synthesis using an automated peptide synthesizer. On the other hand, Nα-Boc-O-(dicyclohexylphosphono)tyrosine and all of the O-[di(4-nitrobenzyl)]phosphono derivatives were prepared as crystalline cyclohexylammonium or dicyclohexylammonium salts.
制备了具有 O-[二(4-硝基苄基)- 或
二环己基膦酰]保护的 Boc-膦酰基
氨基酸衍
生物,并将其应用于 Boc 模式固相合成
磷酸肽。这些保护基团对反式
脂肪酸都很稳定,但在反式
脂肪酸中与
三氟甲磺酸和甲
硫基苯的组合作用下可以去除。在这些衍
生物中,Nα-Boc-O-(
二环己基膦酰基)
丝氨酸和 Nα-Boc-O-(
二环己基膦酰基)苏
氨酸是结晶化合物,可用作使用自动
多肽合成器进行固相合成的起始材料。另一方面,Nα-Boc-O-(
二环己基膦酰基)
酪氨酸和所有 O-[二(4-硝基苄基)]膦酰基衍
生物都制备成结晶环
己基铵盐或二环
己基铵盐。