1.1: 1-chloroethyl chloroformate / 1,2-dichloro-ethane / 3 h / 80 °C 1.2: NaBr / methanol / 18 h / 20 °C 2.1: 89 percent / acetonitrile / 18 h / 73 °C 3.1: tetrahydrofuran / 8 h / -15 - 20 °C View Scheme

in tetrahydrofuran T=-15 - 20°C; 8 h;

sodium carbonate in methanol 0 deg C, 15 min, to rt., 2 h;