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To a cooled (ice-bath) solution of (6-fluoro-2,2-diphenyl-benzo[1,3]dioxol-5-yl)-morpholin-4-yl-methanone (5.70 g, 14.06 mMol) in trifluoroacetic acid (60 ml) was added triethylsilane (2.1 eq, 4.7 ml) over 10 min. The mixture was stirred 20 min at 0° C. and 4 h at room temperature. The volatiles were removed under reduced pressure and the residue purified by column chromatography on silica gel (2:1 ethyl acetate/heptane-ethyl acetate-10:1 ethyl acetate/methanol) to afford (2-fluoro-4,5-dihydroxy-phenyl)-morpholin-4-yl-methanone as liht brown solid (3.19 g, 94%).

1. customThe volatiles were removed under reduced pressure
2. customthe residue purified by column chromatography on silica gel (2:1 ethyl acetate/heptane-ethyl acetate-10:1 ethyl acetate/methanol)