1: triethylamine / benzene / 0.75 h / |Inert atmosphere; |Reflux 2: acetone / 12 h / -15 °C / |Heating 3: sulfuric acid; water 4: potassium tert-butylate; tert-butyl alcohol / 1 h / |Inert atmosphere; |Reflux View Scheme

1: 93 percent / pyridine / 2 h / cooling 2: potassium tert-butoxide / 2-methyl-propan-2-ol / 2.5 h / Heating 3: potassium hydroxide / ethanol / 1 h / Heating View Scheme

potassium hydroxide in ethanol 2 h; Heating;