Halogenation of [2-(trimethylsilyl)ethoxy]methyl (SEM) protected 2,2′-Bi-<i>H</i>-imidazole
作者:Donald P. Matthews、Jeffrey P. Whitten、James R. Mccarthy
DOI:10.1002/jhet.5570240328
日期:1987.5
2,2′-Bi-1H-imidazole, when protected with the [2-(trimethylsilyl)ethoxy]methyl (SEM) blocking group, on treatment with N-bromosuccinimide or N-chlorosuccinimide yields predominantly the monohalogenated derivatives 4a and 4b. The [2-(trimethylsilyl)ethoxy]methyl group is subsequently removed to yield pure mono-halo-2,2′-bi-H-imidazoles 2.
2,2'-双1 ħ咪唑,当与受保护的[2-(三甲基硅基)乙氧基]甲基(SEM)保护基团,与治疗Ñ溴代琥珀酰亚胺或ñ氯琥珀酰亚胺的产率主要为单卤代衍生物4A和4B中。的[2-(三甲基硅基)乙氧基]甲基组随后被去除以得到纯的单卤代-2,2'-双ħ -咪唑2。