A.D. Krishna

InBr3-catalyzed sulfonation of indoles: a facile synthesis of 3-sulfonyl indoles

Indoles react smoothly with sulfonyl chlorides in the presence of a catalytic amount of indium tribromide at ambient temperature to afford the corresponding 3-arylsulfonyl indole derivatives in high yields with high regioselectivity.

Bi(OTf)3 as Mild, Efficient and Cost-Effective Catalyst for the Alkylation of N-Heterocycles with Epoxides

Epoxides undergo smooth ring opening with N-heterocyclic compounds such as indoles and pyrroles in the presence of a catalytic amount of bismuth triflate under mild conditions to produce C-alkylated indole and pyrrole derivatives in high yields with a high regioselectivity. Imidazole and benzotriazole affords N-alkylated products under identical conditions.