反应详情

A mixture of the above solid (0.221 g, 1.49 mmole), 2-imidazoline-2-sulfonic acid (0.805 g, 5.4 mmole) and isobutyl alcohol (4 mL) was reluxed for 18 hours. The solvent was removed in vacuo and the residue was flash chromatographed over silica gel (eluent: 10:2:1 v/v/v ethyl aceate-methanol-triethylamine). The product was obtained in 100% yield (0.337 g) as a pale yellow solid. The above solid was treated in ethanol with 1.0 equivalent of fumaric acid to give a fumarate as a white solid (59% yield): mp 201-203° C. Anal. Calcd. for C12H16N4.1.5C4H4O4.0.5H2O: C, 54.13; H, 5.76; N, 14.04. Found: C, 54.04; H, 5.96; N, 13.69.

1. customThe solvent was removed in vacuo
2. customchromatographed over silica gel (eluent: 10:2:1 v/v/v ethyl aceate-methanol-triethylamine)
3. customThe product was obtained in 100% yield (0.337 g) as a pale yellow solid