Abstract
ABSTRACTNazarov cyclization of indole, benzofuran, and benzo[b]thiophene was accomplished in the presence of catalytic amounts of iron salts. The corresponding cyclization product was obtained for indole derivative in the presence of 5 mol% of Fe(ClO4)3·Al2O3 using the CH2Cl2 solvent system. On the other hand, FeCl3 worked as the common catalyst for realizing cyclization of benzofuran and benzo[b]thiophene derivatives. Very strict combination of the catalyst with solvent was required: 1,2‐dichloroethane was essential for the reaction of benzofuran, while this solvent gave a poor result for benzo[b]thiophene derivatives and CH2Cl2 solvent was the best solvent.
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