4-Toluenesulfonyl chloride → HCID 57186074, compound

Participants

Reaction Conditions

Reaction Steps

Compound 158 (2.27 g, 8.33 mmol) was dissolved in CH2Cl2 (30 mL) and cooled to 0° C. Tosyl chloride (1.91 g, 10.0 mmol) and catalytic DMAP were added, followed by dropwise addition of triethylamine (2.55 mL, 18.33 mmol). The reaction was then stirred at 0° C. for 18 hours. The solvent was rotovapped off (removed under reduced pressure), and the crude material washed with EtOAc and filtered. The solids were washed with EtOAc, and the filtrate washed with 0.5N HCl (20 mL), brine (30 mL), dried over MgSO4, filtered and rotovapped. The oil was chromatographed on silica eluting with a 5% EtOAc/hexanes gradient to 10% EtOAc/hexanes to give 159 (3.399 g, 96%) as an oil. 1H NMR (400 MHz, CDCl3) δ 7.75 (d, J=8.30 Hz, 2H), 7.31 (d, J=8.30 Hz, 2H), 3.99 (dd, J=9.65, 3.54 Hz, 1H), 3.89 (dd, J=9.52, 5.37 Hz, 1H), 2.42 (s, 3H), 2.28 (dd, J=14.7, 6.23 Hz, 1H), 2.19-2.14 (m, 1H), 2.10 (dd, J=14.9, 6.35 Hz, 1H), 1.38 (s, 9H), 1.31-1.17 (m, 3H), 1.08-0.81 (m, 2H), 0.79-0.76 (m, 6H); [α]D=−10.1 (c1 in CHCl3).

Provenance & Evidence