Reaction Steps
Peracetic acid (32% in dilute HOAc, 0.12 mL, 0.512 mmol) was added to a solution of (2S,3S,4R,5S,6R)-2-(3-(4-(4-methoxy-4-oxobutyl)benzyl)-4-methylphenyl)-6-(methylthio)tetrahydro-2H-pyran-3,4,5-triyl triacetate (9, 100 mg, 0.170 mmol) in 1 mL of HOAc and 2 mL of CH3CN at 0° C. The reaction was stirred for 20 min at 0° C. The reaction was quenched with 1N aqueous NaOH, then extracted twice with EtOAc. The combined organic layers were washed with brine, dried over MgSO4, filtered, and the solvents were removed in vacuo to provide a 2:1 diastereomeric mixture of sulfoxides 60 (60 mg, 58% yield) that was carried to the next step without further purification. 1H NMR (400 MHz, CHLOROFORM-d, 2:1 mixture of diastereomers at S, designated as major Ha and minor Hb) δ ppm 7.11-7.17 (m, 2 H), 7.05-7.09 (m, 2 H), 6.97-7.02 (m, 3 H), 5.59 (t, J=9.3 Hz, 1 Hb), 5.46 (t, J=9.3 Hz, 1 Hb), 5.41 (t, J=9.6 Hz, 1 Ha), 5.21 (t, J=9.9 Hz, 1 Ha), 5.17 (t, J=9.3 Hz, 1 Hb), 5.13 (t, J=9.9 Hz, 1 Ha), 4.50 (t, J=10.4 Hz, 1 Ha), 4.48 (d, J=9.9 Hz, 1 Ha), 4.46 (d, J=10.1 Hz, 1 Hb), 4.31 (d, J=10.1 Hz, 1 Hb), 3.93 (m, 2 Hb), 3.92 (m, 2 Ha), 3.66 (s, 3 H), 2.67 (s, 3 Ha), 2.64 (s, 3 Hb), 2.61 (t, J=7.8 Hz, 2 H), 2.33 (t, J=7.3 Hz, 2 H), 2.23 (s, 3 H), 2.09 (s, 3 Ha), 2.08 (s, 3 Hb), 2.02 (s, 3 Hb), 2.01 (s, 3 Ha), 1.93 (quin, J=7.3 Hz, 2 H), 1.75 (s, 3 Ha), 1.74 (s, 3 Hb). MS (ES+) [M+H]+=603.
