Cycloaddition of a mesoionic dithiolone or thiazolone (1) with dimethyl tricyclo[4.2.2.02,5]deca-3,7,9-triene-7,8-dicarboxylate (2) occurred at the cyclobutene ring. Thermal fragmentation of the adducts (3) or the corresponding S-oxides (6) gave dimethyl phthalate and the title diheteratricyclononenone derivatives (4) or their S-oxides (7).
H. Matsukubo and H. Kato, J. Chem. Soc., Perkin Trans. 1, 1976, 2562 DOI: 10.1039/P19760002562
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