Isopropylhydroxylamine → N-Isopropyl-alpha-(2sulfofuran-5-yl)nitrone

Participants

Reaction Steps

N-Isopropylhydroxylamine (from Example A above) and 5-formylfuran-2-sulfonic acid, sodium salt hydrate (5.94 g) were refluxed in methanol (200 mL) for 24 hours. Another portion of N-isopropylhydroxylamine was added and the reaction stirred for 24 hours. The solvent was stripped to provide a pale yellow solid which was recrystallized from ethyl acetate to afford 5.72 g (75% yield) of the title compound, m.p.=230° C. (decomposed). HPLC analysis showed a major product of 88% by area. Depending upon the pH, the title compound was present as the free acid, or, if in the presence of sodium cations and a higher pH, as the sodium salt. Other salt forms can be prepared by changing the cation.

Provenance & Evidence