in dichloromethane Ambient temperature;

1: With carbon tetrabromide T=20°C; 0.5 h; Irradiation; 2: T=20°C; 2 h;

1: ammonium thiocyanate With bromine; triphenylphosphine in acetonitrile T=20°C; 2: tert-butyldimethylsilyl 2-phenylethanoate in acetonitrile T=20°C;