Dimethylformamide → HCID 86728127, compound

Participants

Reaction Steps

To a solution of (R)-tert-butyl-N-(5-(2-fluoro-5-nitrophenyl)-2,2,5-trimethyl-1,1-dioxido-5,6-dihydro-2H-1,4-thiazin-3-yl)-N-tert-butoxycarbonyl-carbamate (1.00 g, 1.888 mmol) (prepared according to the procedure detailed in Intermediate 32, Step 1) in DMF (8 ml) 2-(methylsulphonyl)ethanol (0.49 g, 3.95 mmol) and cesium carbonate (1.28 g, 3.93 mmol) were added and the mixture was stirred overnight at rt. Additional Cs2CO3 (610 mg, 1 eq) and 2-(methylsulphonyl)ethanol (250 mg, 1 eq) were added and stirring continued for additional 2 hrs. The mixture was diluted with EtOAc and saturated ammonium chloride. Organic layer was separated and washed twice with water, then with brine and concentrated. The residue was purified by FC on 40 g RediSep Gold column using 5-100% EtOAc in heptane to afford (R)-tert-butyl-N-(5-(2-hydroxy-5-nitrophenyl)-2,2,5-trimethyl-1,1-dioxido-5,6-dihydro-2H-1,4-thiazin-3-yl)-N-tert-butoxylcarbonyl-carbamate (940 mg, 1.782 mmol, 94% yield). LC/MS (ESI+) m/z=550 (M+Na)

Provenance & Evidence