1: n-butyllithium; N,N,N',N',N'',N''-hexamethylphosphoric triamide / tetrahydrofuran 2: hydrogen; palladium 10 on activated carbon / ethyl acetate 3: pyridinium chlorochromate / dichloromethane 4: sodium hexamethyldisilazane / tetrahydrofuran 5: tetrabutyl ammonium fluoride / tetrahydrofuran 6: hydrogen; palladium 10 on activated carbon / ethyl acetate View Scheme

1: n-butyllithium; N,N,N',N',N'',N''-hexamethylphosphoric triamide / tetrahydrofuran 2: hydrogen; palladium 10 on activated carbon / ethyl acetate 3: pyridinium chlorochromate / dichloromethane 4: sodium hexamethyldisilazane / tetrahydrofuran 5: tetrabutyl ammonium fluoride / tetrahydrofuran 6: hydrogen; palladium 10 on activated carbon / ethyl acetate View Scheme