aluminum oxide; potassium permanganate; neutral in acetone 4 h; Ambient temperature;

potassium permanganate on Y-Zeolite in 1,2-dichloro-ethane 6 h; Ambient temperature;

aluminum oxide; potassium permanganate; neutral in acetone 4 h; Ambient temperature;

sodium hydroxide; dimethylsulfide borane complex; dihydrogen peroxide 1.) THF, 65 deg C, 12 h, 2.) 25 deg C, 12 h; or 1.) 9-borabicyclo<3.3.1>nonane in THF, 25 deg C, 2-3 h; Yield given. Multistep reaction;

in tetrahydrofuran under N2, dropwise addn. of BF3*Et2O to a suspension of NaBH4 in THF at 25°C with stirring, addn. of morpholino derivate after 1h, stirred for additional 3h at 25°C; slowly quenched with MeOH, addn. of NaOH, solvent evapn. (25°C, 12 Torr), alkaline aq. layer cooled to 0°C and acidified (concd. HCl), boronic acid extd.(ether), washed (H2O), dried (MgSO4), evapn.;