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A solution of 16 (7.1 g, 37 mmol) in 150 dry ethanol (150 mL) was placed in a 0.5 L Parr flask and palladium on carbon (0.92 g, 5% wet. Pd/C) was added as a suspension in ethanol (25 mL). The reaction mixture was shaken at 50 psi of hydrogen pressure at room temperature for 24 hours. After this time, the mixture was filtered through a silica gel pad and the solvent was removed at reduced pressure. The residue was purified by flash chromatography (silica gel, 1:3 ethyl acetate/hexanes) to provide 17 (6.7 g, 92%) as a clear oil. 1H NMR (300 MHz, CDCl3) δ1.48 (m, 2H), 1.60 (m, 4H), 2.58 (m, 2H), 3.63 (m, 2H) 3.80 (s, 3H), 6.83 (d, 2H), 7.10 (d, 2H).

1. filtrationAfter this time, the mixture was filtered through a silica gel pad
2. customthe solvent was removed at reduced pressure
3. customThe residue was purified by flash chromatography (silica gel, 1:3 ethyl acetate/hexanes)