Formaldehyde → HCID 10160760, compound

Participants

Reaction Steps

A solution of 1-benzyloxymethyl-4-[(2,4-dichlorophenyl)amino]-2-ethyl-N-methyl-1H-imidazole-5-carboxamide (2.70 g, 6.23 mmol) dissolved in toluene (100 mL) was treated with paraformaldehyde (8.0 g) and p-TsOH.H2O (0.67 g, 3.52 mmol). The reaction mixture was heated at reflux for 15 min. The mixture was cooled to rt, and transferred to a separatory funnel containing saturated aqueous NaHCO3 (150 mL). The aqueous layer was extracted with EtOAc (3×100 mL). The combined organic layers were washed with brine, dried over MgSO4, filtered, and concentrated. The residue was purified by column chromatography on silica gel (40% ethyl acetate in hexanes) to afford 7-benzyloxymethyl-3-(2,4-dichlorophenyl)-8-ethyl-1-methyl-1,2,3,7-tetrahydro-6H-purin-6-one (1.6 g, 58% yield) as a colorless amorphous solid: 1H NMR (300 MHz, CDCl3) δ 7.46 (d, J=2.2 Hz, 1H), 7.34-7.29 (m, 5H), 7.19 (dd, J=8.4, 2.2 Hz, 1H), 7.03 (d, J=8.8 Hz, 1H), 5.84 (s, 2H), 4.85 (s, 2H), 4.71 (s, 2H), 2.97 (s, 3H), 2.77 (q, J=7.7 Hz, 2H), 1.28 (t, J=7.7 Hz, 3H); HRMS (ESI) m/e 445.1212 [(M+H)+, calcd for C22H23N4O2Cl2 445.1198].

Provenance & Evidence