反应详情

Intermediate 4, ethyl 3-(benzyloxy)-8,8-dimethyl-4-oxo-4,6,7,8-tetrahydropyrrolo[1,2-a]pyrimidine-2-carboxylate (342 mg, 1 mmol) was suspended in 5 mL of methanol, treated with a solution of LiOH (48 mg, 2 mmol) in 5 ml H2O then stirred at room temperature for 1 h. The reaction was quenched with 2 mL of 1N HCl. The resulting precipitate was collected by filtration and dried to give 260 mg of the title compound as a crystalline solid (Yield=83%). 1H NMR (300 MHz, CDCl3) δ ppm: 7.46–7.59 (2 H, m) 7.25–7.40 (3 H, m) 5.44 (2 H, s) 3.98–4.15 (2 H, m) 2.04–2.19 (2 H, m) 1.34 (6 H, s); LC/MS m/z 315 (M+H).

1. customThe reaction was quenched with 2 mL of 1N HCl
2. filtrationThe resulting precipitate was collected by filtration
3. customdried