Thermal rearrangement of pyridinium anhydrobases: migration of N-substituents to methine carbon
作者:Alan R. Katritzky、Radi Awartani
DOI:10.1016/0040-4020(82)85086-2
日期:1982.1
N-Benzyl and N-methyl groups migrate to the methinecarbon atom on thermolysis of pyridiniumanhydrobases. Cross-over experiments indicate an intermolecular reaction, probably involving homolysis.
Nucleophilic displacements of N-aryl and heteroaryl groups. Part 2. Pyrylium-mediated transformations of anilines into aryl-sulphur functionality
作者:Alan R. Katritzky、Roland T. Langthorne
DOI:10.1039/p19830002605
日期:——
Carbon disulphide and methyl iodide converted the anhydrobases (3) into 8-[(methylthio)thiocarbonyl]pyridinium iodides (4) which afforded new pyridiniumanhydrobases (5) with ethoxide. These anhydrobasesrearranged into the isomeric ketene S,S-dithioacetals (6), precursors for disulphides.
Nucleophilic displacements of N-aryl and heteroaryl groups. Part 1. Pyrylium-mediated transformation of anilines into phenols
作者:Alan R. Katritzky、Roland T. Langthorne、Hussni A. Muathin、Ranjan C. Patel
DOI:10.1039/p19830002601
日期:——
4-diphenyl-5,6,7,8-tetrahydrochromenylium trifluoromethanesulphonate (5) gave the corresponding pyridinium salts (6;R = aryl) which were converted by base into the anhydrobases (7). Benzoyl chloride converted (7) into the new pyridinium anhydrobases (9). These anhydrobases (9) rearranged at 150 °C into the isomeric phenol enol ethers (10) which were readily hydrolysed to yield the corresponding phenols
与2,4-二苯基-5,6,7,8-四氢氧化铬三氟甲烷磺酸酯的芳香胺(5)得到相应的吡啶鎓盐(6; R =芳基),然后通过碱将其转化为脱水碱(7)。苯甲酰氯将(7)转化为新的吡啶鎓脱水碱(9)。这些无水碱(9)在150℃下重排成异构的酚烯醇醚(10),它们易于水解得到相应的酚。评估结果的机理和综合意义。
Katritzky, Alan R.; Yeung, Wing Kai; Patel, Renjan C., Journal of the Chemical Society. Perkin transactions I, 1982, # 10, p. 2365 - 2368
作者:Katritzky, Alan R.、Yeung, Wing Kai、Patel, Renjan C.
DOI:——
日期:——
Katritzky, Alan R.; Cozens, Andrew J.; Ossana, Andrea, Journal of the Chemical Society. Perkin transactions I, 1985, p. 2167 - 2172
作者:Katritzky, Alan R.、Cozens, Andrew J.、Ossana, Andrea、Rubio, Olga、Dabbas, Nadira