A new route has been developed toward the preparation of pyrroto-3-sulfolenes, which can be used to generate the corresponding 2,3-dimethylene pyrroles, and their cycloaddition and substitution reactions have been successfully performed.Recently, there has been an increasing interest in the study of the preparation and properties of 2,3-dimethylene heteroaromatics (DMHAs) which are analogues of orthoquinodimethane 1.1 Although many of this class of reactive compounds are known, c.g. the five-membered DMHAs 2,2 3,3 4 (X = 0, S, NR),4 5,s 2,3-dimethylene pyridines 6 , h 7,' and the benzo-fused DMHAs 8,E 99 and 10,'" only the derivatives of 2,3-dimethylene indole 10 have been utilized extensively in organic synthesis. Most of the DMHAs are prepared by flash vacuum pyrolysis or by 1,4elimination reaction from suitable precursors. One limitation of these methods is the precursors for DMHAs are sometimes not easily accessible. This might
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