反应详情

To a solution of tert-butyl 4-(7-acetoxy-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (0.43 g, 1.2 mmol) in THF (15 mL) was added LiOH (3M, 6 mL). The mixture was stirred at room temperature overnight. The mixture was quenched with 2N HCl (9 mL) and then extracted with DCM (3×100 mL). The organic phase was dried and concentrated. The residue was subject to chromatography on silica gel, eluted by DCM/MeOH (20:1) to afford the tert-butyl 4-(7-hydroxy-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)piperazine-1-carboxylate (0.37 g, 97%). 1H NMR (CDCl3, 400 MHz) δ 8.51 (m, 1H), 5.06-5.04 (m, 1H), 3.80-3.69 (m, 4H), 3.56-3.45 (m, 4H), 3.10-3.05 (m, 1H), 2.94-2.86 (m, 1H), 2.51-2.44 (m, 1H), 2.00-1.94 (m, 1H), 1.48 (s, 9H). MS (APCI+) [M+H] +321.

1. customThe mixture was quenched with 2N HCl (9 mL)
2. extractionextracted with DCM (3×100 mL)
3. customThe organic phase was dried
4. concentrationconcentrated
5. washeluted by DCM/MeOH (20:1)