中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | ethyl 1-acetyl-1,4,5,6-tetrahydropyridine-3-carboxylate | 917112-54-0 | C10H15NO3 | 197.234 |
—— | ethyl 1-(2,2-dimethylpropanoyl)-3,4-dihydro-2H-pyridine-5-carboxylate | 917112-57-3 | C13H21NO3 | 239.315 |
—— | 5-O-ethyl 1-O-methyl 3,4-dihydro-2H-pyridine-1,5-dicarboxylate | 917112-55-1 | C10H15NO4 | 213.233 |
—— | 1-O-tert-butyl 5-O-ethyl 3,4-dihydro-2H-pyridine-1,5-dicarboxylate | 917112-58-4 | C13H21NO4 | 255.314 |
A method for the HMPA (hexamethylphosphoric triamide)-catalyzed metal-free transfer hydrogenation of pyridines has been developed. The functional group tolerance of the existing reaction conditions provides easy access to various piperidines with ester or ketone groups at the C-3 site. The suitability of this method for the reduction of other N-heteroarenes has also been demonstrated. Thirty-three examples of different substrates have been reduced to designed products with 45–96% yields.