Rapid access to CF3-containing heterocycles

The silyl-Prins and aza-silyl-Prins reactions have been employed for the preparation of 6-CF3-substituted dihydropyrans and 6-CF3-substituted tetrahydropyridines. The product heterocycles have been further elaborated to a number of products, including CF3-substituted pipecolates and hydroxylated pyrans and piperidines.