反应详情

N-(4-bromobenzyl)-2,2-diethoxyacetimidamide (1.53 g, 4.85 mmol) in sulfuric acid (4 mL, 95-98%) was heated at 40 C for 14 h. The mixture was neutralized with 1 M NaOH to pH 7 and the resulting suspension was filtered. The residue was purified by silica gel chromatography with 20-55% ethyl acetate in hexanes. The desired fractions were concentrated to give a brownish yellow solid (0.434 g, 40%). LCMS: R.T.=1.62; [M+2]+=225.1.

1. filtrationthe resulting suspension was filtered
2. customThe residue was purified by silica gel chromatography with 20-55% ethyl acetate in hexanes
3. concentrationThe desired fractions were concentrated