N-Phosphorylated Imidazolium Salts as Precursors to 2- and 5-Phosphorylated Imidazoles and New Imidazol-2-ylidenes Featuring the PNCN Unit
作者:Anatolii P. Marchenko、Heorgii N. Koidan、Anastasiya N. Huryeva、Evgeniy V. Zarudnitskii、Aleksandr A. Yurchenko、Aleksandr N. Kostyuk
DOI:10.1021/jo101177h
日期:2010.11.5
It has been experimentally proven that the reaction of 1- or 1,2-disubstitutedimidazoles with diorganylphosphorus(III) halides proceeds via initial formation of N-phosporylated imidazolium salts. Treatment of these salts with strong bases results in phosphorylation of the parent imidazoles at the 2- or 5-positions, correspondingly. In a previous case, imidazol-2-ylidenes are formed as intermediates