“…1 H NMR (400 MHz, CDCl 3 ): = 8.21-8.16 (m, 3 H), 7.93 (s, 1 H), 7.87 (d, J = 8.0 Hz, 1 H), 7.68-7.64 (m, 1 H), 7.58-7.48 (m, 3 H), 7.43-7.38 (m, 1 H), 3.41 (q, J = 7.5 Hz, 2 H), 1.54 (t, J = 7.6 Hz, 3 H). 13 General procedure A: A mixture of sodium azide (130 mg, 2.0 mmol, 4.0 equiv), 2 (150 mg, 0.50 mmol, 1.0 equiv), 18-crown-6 (660 mg, 2.5 mmol, 5.0 equiv) and CsF (377 mg, 2.5 mmol, 5.0 equiv) in CH 3 CN (3 mL) was stirred at 70 °C for 12 h. Product 7 was isolated as a colorless solid (37 mg, 62%).…”