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Communication | Regular issue | Vol 16, No. 12, 1981, pp.2133-2136
Published online, 1st January, 1970
DOI: 10.3987/R-1981-12-2133
1,6-Dihydro-3(2H)-pyridinones as Synthetic Intermediates. Protochemical [2+2]Cycloaddition with Vinyl Acetate

Takeshi Imanishi, Yasuaki Wada, Makoto Inoue, and Miyoji Hanaoka*

*Faculty of Pharmaceutical Scicences, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan


Photochemical [2+2] cycloaddition of 1,6-dihydro-3(2H)-pyridinones (1a and 1b) with vinyl acetate gave the cycloadducts (2a and 2b). Utilizing this reaction as a key step, 1b was converted into the 4-substituted 1,6-dihydro-3(2H)-pyridinone (3) and the 4-substituted 3-piperidinone (4).