potassium tert-butylate in tetrahydrofuran T=0°C; Hydrolysis; 1 h;

1: 98 percent / 1.) 25 deg C, 1 h, 2.) reflux, 30 min 2: 90 percent / aq. HCl / nitromethane / 12 h / -4 °C View Scheme

1: 98 percent / 1.) 25 deg C, 1 h, 2.) reflux, 30 min 2: 90 percent / aq. HCl / nitromethane / 12 h / -4 °C 3: 8 percent / Ac2O / 3 h / 115 °C View Scheme