Methane → 2-(1H-indol-3-yl)-5,5-dimethylcyclohexane-1,3-dione

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To a mixture of 2-(1-acetyl-1H-indol-3-yl)-5,5-dimethylcyclohexane-1,3-dione of Example 1e (74.8 g, 0.25 mol) and methanol (30 mL), a solution of sodium hydroxide (30 g, 0.75 mol) in water (300 mL) was added at room temperature under stirring. The reaction mixture was heated at 60° C. for 2 h under stirring, and then activated charcoal (10 g) and water (300 mL) were added. The mixture was stirred for 10 min, charcoal was filtered off, and the filtrate was acidified with hydrochloric acid to pH 2. The solid product was filtered off, washed with water and dried to give 38.3 g (60%) of the colorless solid; m.p. 173° C.

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