hydrogenchloride in methanol; water T=70°C; 3.5 h;

With  2,4,6-trimethyl-pyridine; acetic anhydride; trifluoroacetic anhydride  3-4 deg C, 30 min then 35 deg C, 108 h; repeated addition of reagents;   

With  2,4,6-trimethyl-pyridine; acetic anhydride; trifluoroacetic anhydride  3-4 deg C, 30 min then 35 deg C, 108 h; repeated addition of reagents;