1: 89 percent / BBr3 / CH2Cl2 / 1) -22 deg C, 2 h, 2) r.t., 36 h 2: 86 percent / Cu2O, pyridine / 2 h / Heating View Scheme

1: 89 percent / BBr3 / CH2Cl2 / 1) -22 deg C, 2 h, 2) r.t., 36 h 2: 97 percent / Cu2O, pyridine / 2 h / Heating; other alkynes, also with 8-iodoumbelliferone 3: 48 percent / conc. HCl / 24 h / 95 °C View Scheme