1: With pyridine; p-tolyl chlorothionoformate in tetrahydrofuran T=0 - 20°C; Barton-McCombie deoxygenation; 72 h; Inert atmosphere; 2: With 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in toluene T=60 - 70°C; Barton-McCombie deoxygenation; Inert atmosphere;