Sulfuric Acid → HCID 131728690, compound

Participants

Reaction Conditions

Reaction Steps

2-Bromo-3-hydroxy-cylohex-2-enone (80.0 g, 420 mmol) is added to a mechanically stirred reactor followed by methanol (300 mL). To the mixture is then added trimethyl orthoformate (186 mL, 1.70 mol, 4 eq) and sulfuric acid (9 mL). The resulting mixture is stirred for 2 h until completion and hydroxylamine sulfate (34.4 g, 210 mmol, 0.5 eq) is added as a solid. The mixture is heated to 40° C. and stirred at that temperature until complete conversion (2-2.5 h). The solution is then cooled to 5° C. and the pH is adjusted to 7 with saturated sodium bicarbonate (˜1100 g). The precipitate formed is collected by filtration (filter 10 cm diameter, 1.5 cm cake thickness, <1 min total filtration time) rinsed with heptane (200 mL) and dried under nitrogen flow for 4-6 h to provide 50.8 g, (55% yield) of 2-bromo-3-methoxy-cylohex-2-enone oxime.

Provenance & Evidence