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Paper | Special issue | Vol 79, No. 1, 2009, pp.627-633
Published online, 13th November, 2008
DOI: 10.3987/COM-08-S(D)28
Synthesis of 1,2,4-Triazin-5-ones through [4+2] Cycloaddition of 1,2,4-Triaza-1,3-dienes with Diphenylketene

Tatsuya Nakai, Kyoko Fukutomi, Hiroaki Yanagisawa, Tomomi Kawasaki, and Masanori Sakamoto*

*Kyushu University of Health and Welfare, , Japan


On heating 1,2,4-triaza-1,3-dienes 1 with diphenylketene, [4+2] cycloaddition took place smoothly to afford the corresponding 1,2,4-triazin-5-one derivatives 2 in good yield.