hydrogenchloride in diethyl ether

1: 1.) isopropenyl chloroformate, di-isopropylethylamine / 1.) ethyl acetate, -10 deg C, 5 min, 2.) diethyl ether, 0 deg C, 30 min 2: 87 percent / 3 M HCl / diethyl ether View Scheme

hydrogenchloride 1.) THF, 4 deg C, overnight, 2.) THF, 0 deg C, 3 h; Yield given. Multistep reaction;

hydrogenchloride in N,N-dimethyl-formamide T=0°C; 3 h;