Cyclopropylamine → 2-chloro-N-cyclopropylfuro[3,2-d]pyrimidin-4-amine

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Reaction Steps

2,4-Dichlorofuro[3,2-d]pyrimidine (30 g, 159 mmol, ArkPharm) was stirred in 1,4-dioxane (330 mL). TEA (26.5 mL, 190 mmol) and cyclopropylamine (12.2 mL, 175 mmol) were added and the mixture stirred at rt overnight. The mixture was diluted with EtOAc (500 mL) and washed with saturated aqueous NaHCO3 (400 mL). The aqueous layer was extracted with EtOAc (2×150 mL). The organic layers were combined, dried with anhydrous MgSO4, filtered, and concentrated in vacuo. The residue was suspended in water (400 mL) and allowed to stir at rt for about 1 h. The suspension was filtered and the solid was dried in a vacuum oven at about 70° C. overnight to give 2-chloro-N-cyclopropylfuro[3,2-d]pyrimidin-4-amine (31.9 g, 96%); LC/MS (Table 2, Method c) Rt=1.58 min.; MS m/z: 210 (M+H)+, 1H NMR (400 MHz, CDCl3) δ 7.77 (d, J=2.1 Hz, 1H), 6.79 (d, J=2.1 Hz, 1H), 5.57-5.50 (m, 1H), 3.12-3.01 (m, 1H), 1.02-0.88 (m, 2H), 0.77-0.65 (m, 2H).

Provenance & Evidence