6, 7-Dimethylene-3-thiabicyclo [3.2. 0] heptane-3, 3-dioxide, a masked form of [4] dendralene and conjunctive reagent for tandem annelations

CM Buchan, JIG Cadogan, I Gosney…

Index: Buchan, Caroline M.; Cadogan, J. I. G.; Gosney, Ian; Henry, William J. Journal of the Chemical Society, Chemical Communications, 1985 , # 24 p. 1785 - 1786

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Abstract

Previous limitations of highly reactive [4] dendralene [3, 4-dimethylenehexa-1, 5-diene (1)] as a tandem annelating reagent in Diels–Alder reactions are overcome by use of its masked form, 6, 7-dimethylene-3-thiabicyclo [3.2. 0]-heptane-3, 3dioxide (2), and subsequent extrusion of SO2 under flash vaccum pyrolytic conditions.