Reactions of 2-methylene-3-phenacylbenzothiazoline and 3-benzyl-2-methylenebenzothiazoline, generated in situ from the corresponding 2-methylbenzothiazolium bromide and triethylamine, with methylenecyclopropenes gave a variety of products, cross-conjugated systems, spiro-cyclopentafurans and/or cyclopentabenzothiazines, depending on the nature of substituents of the methylenecyclopropenes. The reaction pathways for the formation of products are also described.
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Tsuge et al. (1983) studied this question.
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