manganese(IV) oxide in dichloromethane T=25°C; 48 h;

diisobutylaluminium hydride in toluene T=-30°C; 0.5 h;

1: With oxalyl dichloride; N,N-dimethyl-formamide in tetrahydrofuran; pyridine; acetonitrile T=-30°C; 1.5 h; 2: With copper(l) iodide; tri-tert-butoxyaluminum hydride in tetrahydrofuran; pyridine; acetonitrile T=-78°C; 0.25 h;

Pd-BaSO4; xylene T=160 - 170°C; Hydrogenation;

potassium hydroxide