6,7-Dimethylene-3-thiabicyclo[3.2.0]heptane-3,3-dioxide, a masked form of [4]dendralene and conjunctive reagent for tandem annelations

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.

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