Alkenoate 5 prepared on a multigramme scale from trifluoroethanol underwent cycloaddition with furan in good yield. Reduction of the ester group in the endo-cycloadduct 7a with DIBAl-H also resulted in decarbamoylation to reveal a diol which was protected as an acetonide 10. Various methods for nucleophilic ring opening were explored releasing highly functionalised difluorinated cyclohexenols, and suggesting a novel route to difluorinated analogues of cyclitols and monosaccharides.
- fluorinated dienophile
- ring opening