sodium tetrahydroborate; 2,2'-azo-bisisobutyronitrile; tributyltin chloride in toluene; tert-butyl alcohol Cyclization; Reduction; Heating; Title compound not separated from byproducts.;

1: With sodium tetrahydroborate; 2,2'-azo-bisisobutyronitrile; tributyltin chloride in toluene; tert-butyl alcohol Cyclization; Heating; 2: With pyridinium chlorochromate in dichloromethane Oxidation; 1 h; Heating; Further stages.;