Sodium Bicarbonate → HCID 86728117, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl ((5R)-6-allyl-5-(5-bromo-2-fluoropyridin-3-yl)-2,2,5-trimethyl-1,1-dioxido-5,6-dihydro-2H-1,4-thiazin-3-yl)carbamate (0.988 g, 1.96 mmol) in MeOH (5 mL) and DCM (15 mL) at room temperature was added sodium bicarbonate (0.333 g, 3.96 mmol). The reaction mixture was cooled to −78° C. and ozone was bubbled through the solution. After 15 min, the solution turned blue and oxygen was bubbled through the mixture for 5 min. Sodium borohydride (0.154 g, 4.07 mmol) was added and the reaction mixture was removed from the −78° C. bath. The solution was warmed to room temperature, stirred for 1 h, and quenched with saturated NH4Cl, and diluted with EtOAc water. The aqueous phase was extracted with EtOAc (2×). The combined organic extracts were washed with brine (1×), dried over MgSO4, filtered, concentrated. Purification by flash column chromatography on silica gel (40 g, 20% to 60% EtOAc in hexanes) gave tert-butyl ((5R)-5-(5-bromo-2-fluoropyridin-3-yl)-6-(2-hydroxyethyl)-2,2,5-trimethyl-1,1-dioxido-5,6-dihydro-2H-1,4-thiazin-3-yl)carbamate (0.913 g, 1.80 mmol, 92% yield) as a mixture of isomers that was used in the next step without separation. LC/MS (ESI+) m/z=508 (M+H).

Provenance & Evidence