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.