Regioselectively produced 2‐ and 3‐acetyl‐1‐(phenylsulfonyl)pyrroles can be reduced to the corresponding alcohols and subsequently dehydrated to afford N‐protected vinylpyrroles. These remarkably stable vinylpyrroles can then serve as heterodienes in [4 + 2] cycloaddition reactions with electron deficient dienophiles to afford tetrahydroindole derivatives.
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Xiao et al. (1995) studied this question.
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