Reaction of o-phenylenediamine with thiophenols^a.

^aReaction conditions: 1a (0.2 mmol), 2 (0.5 mmol), 4-ADPA (0.2 mmol), paraformaldehyde (0.8 mmol), TCE (0.7 mL), H₂O (0.2 mL), 130 °C, 3 h, air. Isolated yield based on 1a.