Studies on peptides. LXXXV. A new deprotecting procedure for p-toluenesulfonyl and p-methoxybenzenesulfonyl groups from the Nim-function of histidine.
作者:KOUKI KITAGAWA、KUNIAKI KITADE、YOSHIAKI KISO、TADASHI AKITA、SUSUMU FUNAKOSHI、NOBUTAKA FUJII、HARUAKI YAJIMA
DOI:10.1248/cpb.28.926
日期:——
The chemical behavior of Nim-p-methoxybenzenesulfonylhistidine, His (MBS), was examined. This new Nim-protecting group was removable by HF or N-hydroxybenzotriazole, like the Nim-Tos group, but was more acid-stable than the Tos group with methanesulfonic acid or HBr. The Nim-MBS group was stable to treatment with trifluoroacetic acid in the presence of anisole, but was found to be cleaved smoothly by the same acid in the presence of dimethylsulfide at room temperature within an hour. The Nim-Tos group was also removable under similar conditions, but at a somewhat lower rate.
研究了 Nim-p-methoxybenzulfonylhistidine, His (MBS) 的化学特性。与 Nim-Tos 基团一样,这种新的 Nim 保护基团可被 HF 或 N-hydroxybenzotriazole 清除,但与 Tos 基团相比,它在甲磺酸或 HBr 中的酸稳定性更强。Nim-MBS 基团对在苯甲醚存在下用三氟乙酸处理很稳定,但在室温下,在二甲基硫醚存在下,同一酸会在一小时内顺利裂解。在类似条件下,Nim-Tos 基团也能被清除,但清除率较低。