1: 19.1 g / AlCl3 / CS2 / 24 h / 20 - 55 °C 2: 1.) 1-hydroxybenzotriazole, N,N'-dicyclohexylcarbodiimide / 1.) DMF, 1 h, 2.) RT, 18 h View Scheme

benzotriazol-1-ol; dicyclohexyl-carbodiimide 1.) DMF, 1 h, 2.) RT, 18 h; Yield given. Multistep reaction;