Hydroxylamine HCl → 1-Ethoxycarbonylmethyl-7-(3-hydroxyiminomethyl-1-pyrrolyl)-6-trifluoromethyl-2,3(1H,4H)-quinoxalinedione

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Reaction Steps

1.2 g (2.9 mmol) of the compound from Example 70, 0.4 g (6 mmol) of hydroxylammonium chloride and 0.48 g (6 mmol) of sodium acetate in 45 ml of H2O/EtOH (2:1) were refluxed for 30 minutes. The organic solvent was removed under reduced pressure, and the resulting aqueous phase was extracted with ethyl acetate. The organic phase was dried and concentrated under reduced pressure. The residue was recrystallized from ethanol to yield 1.6 g (70%) of the product. Melting point >250° C.

Provenance & Evidence