tert-Butyl 4-(2,2,2-trifluoro-1-hydroxyethyl)piperidine-1-carboxylatetert-Butyl 4-(1-hydroxy-2,2,2-trifluoroethyl)piperidine-1-carboxylate4-(1-Hydroxy-2,2,2-trifluoroethyl)piperidine, N-BOC protected1-(tert-Butoxycarbonyl)-4-(1-hydroxy-2,2,2-trifluoroethyl)piperidine