triethylamine in methanol T=25°C; Acylation; 24 h;

1: toluene / 20 h / Heating 2: 98 percent / CH2Cl2 / 84 h 3: 1.) n-BuLi / 1.) hexane, THF, -70 deg C, 1 h, 2.) -70 deg C, 8 h 4: 82 percent / aq. HCl / diethyl ether / 24 h / Ambient temperature View Scheme