Studies on peptides. LXXXIII. Behavior of S-substituted cysteine sulfoxides under deprotecting conditions in peptide synthesis.
作者:SUSUMU FUNAKOSHI、NOBUTAKA FUJII、KENICHI AKAJI、HIROSHI IRIE、HARUAKI YAJIMA
DOI:10.1248/cpb.27.2151
日期:——
Sulfoxides of Cys (S-p-methoxybenzyl) and Cys (S-benzyl) were prepared by oxidation with sodium perborate. Hydrogen fluoride and methanesulfonic acid converted the former sulfoxide to S-p-methoxyphenylcysteine or S-p-hydroxyphenylcysteine in the presence of anisole or phenol, respectively, while the latter sulfoxide resisted the actions of these deprotecting reagents. Thiophenol appears to be useful as a powerful reducing reagent for protected cysteine sulfoxides.
用过硼酸钠氧化法制备了 Cys(S-对甲氧基苄基)和 Cys(S-苄基)的亚砜。在苯甲醚或苯酚存在下,氟化氢和甲磺酸分别将前一种亚砜转化为 S-对甲氧基苯基半胱氨酸或 S-对羟基苯基半胱氨酸,而后一种亚砜则能抵抗这些脱保护试剂的作用。噻吩酚似乎是保护半胱氨酸亚砜的强力还原试剂。