1: With triethylamine; isobutyryl chloride in toluene 9 h; Heating; 2: With sodium hydroxide in methanol 0.25 h; Heating; Further stages.;

1: With tetra(n-butyl)ammonium hydrogensulfate; potassium carbonate in acetone T=20 - 75°C; Baker-VenKataraman transformation; 12 h; 2: With potassium hydroxide in ethanol 0.333333 h; Heating; Further stages.;