m-Chloroperbenzoic acid → HCID 67865713, compound

Participants

Reaction Steps

(2S)-2,3-Dimethylbutyl-p-tolylsulfoxide (4) (52 mg, 0.2 mmol) was dissolved in 1.0 mL of anhydrous dichloromethane and 60 mg (0.3 mmol) of 3-chloroperoxybenzoic acid (80-85%, Sigma) added with stirring. The reaction mixture was stirred for 2 h and quenched with 10% sodium bicarbonate. More dichloromethane was added and the combined organic extracts were washed with aqueous sodium sulfite and brine and dried with MgSO4. The solvent was removed in vacuo and the crude sulfone was purified by silica gel flash chromatography using hexane ethyl acetate mixtures to afford sulfone (6) as a colorless oil. For analytical purposes this was also purified by HPLC (Zorbax Sil 9.4×25 cm column) using 10% ethyl acetate in hexane to give 42 mg of pure (2S)-sulfone (6): [α]D20 =+17 (c=3.5 in CHCl3); MS m/z (relative intensity) 240 (M+, 3), 197 (5), 157 (100), 92 (19), 91 (27), 85 (25), 84 (31), 43 (72); 1H NMR δ 0.77 (3H, d, J=7 Hz), 0.82 (3H, d, J=7.0 Hz), 1.00 (3H, d, J=7.0 Hz), 1.66-1.98 (2H, m), 2.45 (3H, s, CH3 -Aryl), 2.86 (1H, dd, J=8, 11 Hz), 3.06 (1H, dd, j=4, 12 Hz), 7.35 (2H, d, J=7.0 Hz, H-aryl ortho), 7.75 (2H, d, J=8, H-aryl ortho).

Provenance & Evidence