A two-step synthesis of fluorescent 2,3-dihydrobenzo[e]indole derivatives using only 1H-1,2,3-triazoles as starting materials was developed. At the first step of the synthesis, the 1-alkyl-1,2,3-triazole reacts with two 1-sulfonyl-1,2,3-triazole molecules via the domino transannulation/sulfonamidovinylation sequence under rhodium catalysis. The reaction involving two different 1-sulfonyltriazoles is accomplished in one pot. The further SEAr cyclization of the formed 4-aryl-5-(sulfonamidovinyl)pyrroles using Eaton’s reagent provides 2,3-dihydrobenzo[e]indoles having a sulfonylimino-, hydroxy-, and primary amino groups at the C1, C2, and C5 positions, respectively.