Facilitation of addition–elimination reactions in pyrimidines and purines using trifluoroacetic acid in trifluoroethanol
作者:Hayley J. Whitfield、Roger J. Griffin、Ian R. Hardcastle、Andrew Henderson、Jerome Meneyrol、Veronique Mesguiche、Kerry L. Sayle、Bernard T. Golding
DOI:10.1039/b308948g
日期:——
SNAr displacement reactions of 6-cyclohexylmethoxy-2-fluoropurine, 6-amino-2-butylsulfonyl-4-cyclohexylmethoxypyrimidine and 2-amino-6-chloropurine with substituted anilines (e.g. the weakly nucleophilic 4-aminobenzenesulfonamide) are dramatically accelerated in the presence of trifluoroacetic acid and occur especially efficiently in 2,2,2-trifluoroethanol solvent.
6-环己基甲氧基-2-氟嘌呤、6-氨基-2-丁基磺酰基-4-环己基甲氧基嘧啶和 2-氨基-6-氯嘌呤与取代苯胺(如弱亲核的 4-氨基苯磺酰胺)的 SNAr 置换反应在三氟乙酸存在下显著加快,在 2,2,2-三氟乙醇溶剂中发生的反应尤其有效。