Hydrochloric Acid → HCID 22053942, compound

Participants

Reaction Conditions

Reaction Steps

A solution of diisopropylamine (1.92 mL, 13.68 mmol) in dry THF (50 mL) was cooled to −20° C. A 2.5M solution of n-butyl lithium in hexane (4.4 mL) was added with a syringe. The mixture was stirred for 30 min and then cooled to −78° C. A solution of 4-benzyl-3-(4-cyclohexyl-butyryl)-oxazolidin-2-one (3 g, 9.12 mmol) in THF (10 mL) was added slowly over 3 min. Stirring was continued for 30 min, then a solution of 2-Bromo-1-morpholin-4-yl-ethanone (2.28 g, 10.94 mmol) in THF (4 mL) was added over 3 min. The mixture was allowed to come to room temperature over 5 h. 1N HCl (50 mL) was added and the product was extracted with ethyl acetate (3×100 mL). The combined organic layers were washed with saturated aqueous NaHCO3 (200 mL) and brine (200 mL), dried with MgSO4 and evaporated under vacuum. The product (1-(4-benzyl-2-oxo-oxazolidin-3-yl)-2-(2-cyclohexyl-ethyl)-4-morpholin-4-yl-butane-1,4-dione) was obtained after purification by flash chromatography as a single diastereomer (2.5 g). 1H NMR: (CDCl3) 7.35–7.22(m, 5H), 4.69–4.62 (m, 1H), 4.28–4.10 (m, 3H), 3.76–3.46 (m, 8H), 3.37 (d, J=13.6 Hz, 1H), 2.91 (ddd, J=16.4 Hz, J=13 Hz, J=3 Hz, 1H), 2.76 (ddd, J=13.5 Hz, J=11 Hz, J=3 Hz, 1H), 2.51 (dt, J=13.6 Hz, J=3 Hz, 1H), 1.76–0.80 (m, 15H). MS: (M+H)+ 457.

Provenance & Evidence