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Communication | Special issue | Vol 66, No. 1, 2005, pp.39-43
Published online, 16th August, 2005
DOI: 10.3987/COM-05-S(K)9
■ [2+2] and [2+4] Type Cycloadditions of Isocyanates with Ynolates

Mitsuru Shindo,* Akiko Harada, Kenji Matsumoto, and Kozo Shishido

*Kyushu University, 6-1, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan

Abstract

Ynolates react with isocyanates to give azetidine-2,4-diones via a [2 + 2] type cycloaddition. The [4 + 2] type cycloaddition proceeds in the reactions of vinyl isocyanates with ynolates to provide 2-pyridones.