4-Piperidinol, 1,2,2,6,6-pentamethyl- → 1,2,2,6,6-Pentamethylpiperidin-4-yl 3-(5-Phenylsulfonylbenzotriazol-2-yl)-5-tert-butyl-4-hydroxyhydrocinnamate

Participants

Reaction Conditions

Reaction Steps

Methyl 3-(5-phenylsulfonylbenzotriazol-2-yl)-5-tert-butyl-4-hydroxyhydro-cinnamate (5 g, 0.01 mol), xylenes (18 g, 0.17 mol), 1,2,2,6,6-pentamethyl-4-hydroxy-piperidine (2.1 g, 0.012 mol) and dioctyltin oxide (0.5 g, 0.0014 mol) are charged to a reactor and heated to 160° C. while being vigorously stirred. At the end of six hours, any remaining xylene is removed by distillation under vacuum. The crude yellow oil obtained is chromatographed through a pad of silica gel using ethyl aetate as the eluent. The title compound is obtained in a 70% yield as a low melting yellow solid, melting at 45-52° C., whose structure is consistent with 1Hnmr and mass spectrometry.

Provenance & Evidence