Selective nitrogen protection of hydroxyalkylbenzimidazoles using 2,2,2-trichloroethylchloroformate
作者:Richard C. Woudenberg、E. Bryan Coughlin
DOI:10.1016/j.tetlet.2005.07.037
日期:2005.9
for selective N-protection of hydroxyalkylbenzimidazoles using 2,2,2-trichloroethylchloroformate (Troc-Cl) applicable to various alkyl chain lengths has been developed. In the specific case of 5-(1-[2,2,2-trichloroethyl formyl]-benzimidazol-2-yl)-propan-1-ol, migration of Troc from the benzimidazole to the primary alcohol occurs in the presence of triethylamine, allowing the choice of selective N-Troc
已经开发了使用适用于各种烷基链长的2,2,2-三氯乙基氯甲酸酯(Troc-Cl)对羟基烷基苯并咪唑进行选择性N-保护的方法。在5-(1- [1- [2,2,2-三氯乙基甲酰基]-苯并咪唑-2-基)-丙-1-醇的特定情况下,Troc从苯并咪唑向伯醇的迁移在三乙胺存在下发生,从而可以选择选择性的N-Troc或O-Troc保护。