Process for preparing sulfonamide-containing indole compounds

摘要

A process for preparing a compound (5a) represented by the following formula: wherein R¹ and R² each independently represent hydrogen, C_1-4 alkyl, etc. and A represents cyanophenyl, etc., characterized by reacting a compound (3a) represented by the following formula: wherein R¹ and R² have the same definitions as above, with a compound represented by the formula A-SO₂Cl, wherein A has the same definition as above, in the presence of a base, in a mixed solvent of water and C_1-6 alkyl acetate.