Novel 1-substituted-4-aroyl-4-hydroxy and -4-acyloxypiperidines and acid addition salts thereof, useful as central nervous system depressants and neuroleptics with pronounced antipsychotic effects, are disclosed. Methods of making same, pharmaceutical compositions thereof, a method of treating therewith, and important and novel intermediates for the production thereof, are also disclosed.
Photocatalyst-controlled and visible light-enabled selective oxidation of pyridinium salts
作者:Xiang-Jun Peng、Hai-Ping He、Qian Liu、Kun She、Bao-Qi Zhang、Heng-Shan Wang、Hai-Tao Tang、Ying-Ming Pan
DOI:10.1007/s11426-020-9958-6
日期:2021.5
methods of photocatalytic-controlled and visible light-induced selective oxidation of pyridiniums with air as the terminal oxidant. The key to these transformations is to choose the appropriate light source and photocatalyst. Pyridiniums are successfully converted into pyrroles through oxygen-mediated cycloaddition, proton-coupled electron transfer (PCET), pyridine ring opening, and recyclization. The
A short, scalable and environmentally benignsynthesis of 2- and 4-substitutedbenzylpiperidines has been developed. The method is based on the temperature-programmed consecutive deoxygenation and heteroaromatic ring saturation of aryl(pyridin-2-yl)- and aryl(pyridin-4-yl)methanols and aryl(pyridin-4-yl)methanones in the presence of Pd/C catalyst. The crucial roles of the temperature, the acidity and