The N-(2,4-dinitrophenyl) salts of N,N-diethylnicotinamide and ethyl nicotinate undergo [4+ + 2] cycloaddition with enol ethers at room temperature, providing the first examples of Bradsher cyclization by monocyclic quaternary aza-aromatics; other derivatives and salts of pyridine are inert under these conditions.
|Original language||English (US)|
|Number of pages||2|
|Journal||Journal of the Chemical Society, Perkin Transactions 1|
|State||Published - 1990|
ASJC Scopus subject areas