A new system for the facile reduction of Met(O) in protected peptides (dimethylformamide-sulfur trioxide complex/iodide ion) was introduced. Met(O) in protected Met-enkephalins and protected leucosulfakinins were reduced to Met within 1h by this system, and the reducing ability of this new system seemed comparable to or greater than that of the formerly reported dimethylformamide-sulfur trioxide complex/ethanedithiol system. The methylsulfinylbenzyl protecting group of Tyr was also reduced to a methylthiobenzyl group by this system.
一种新系统被引入,用于在保护肽中便捷地还原Met(O)(二
甲基甲
酰胺-
三氧化硫复合物/
碘离子)。在此系统的作用下,保护的Met-恩凯法林和保护的白介素
硫肽中的Met(O)在1小时内被还原为Met。这个新系统的还原能力似乎与以前报道的二
甲基甲
酰胺-
三氧化硫复合物/
乙烷二
硫系统相当或更强。此外,Tyr的
甲基亚磺酰
苯基保护基也被该系统还原为
甲基硫苯基基团。