potassium hydroxide

1: aqueous NaOH; dioxane 2: ethanolic KOH View Scheme

1: 5-methoxy-1,2-dimethyl-indole-3-carboxylic acid With oxalyl dichloride; N,N-dimethyl-formamide in dichloromethane T=0 - 20°C; 1 - 2 h; 2: methanol T=20 - 60°C; 2 - 16 h;