反应详情

Pyridine (2.18 mL, 26.9 mmol) and benzyl chloroformate (1.53 g, 8.96 mmol) were added sequentially, each in one portion, to a stirred solution of 2-chloro-4-(1,4-dioxaspiro[4.5]dec-8-yl)aniline (2.40 g, 8.96 mmol) in THF (30 mL) at 5° C. and the reaction mixture was stirred at 10° C. for 3 h. Ethyl acetate (75 mL) was added and the mixture was washed with H2O (2×30 mL) and brine. The organic layer was dried (MgSO4) and concentrated in vacuo to leave a solid, which was purified by column chromatography, using a gradient of 20-50% ethyl acetate:isohexane as eluent, to give the title compound (2.6 g, 72%) as a white solid; 1H NMR δ 1.65-1.93 (8H, m), 2.49-2.6 (1H, m), 4.0 (4H, s), 5.25 (2H, s), 7.12 (1H, s), 7.15 (1H, dd), 7.25 (1H, d), 7.37-7.48 (5H, m), 8.08 (1H, d); MS m/e (M−H)− 400.

1. washthe mixture was washed with H2O (2×30 mL) and brine
2. dry with materialThe organic layer was dried (MgSO4)
3. concentrationconcentrated in vacuo
4. customto leave a solid, which
5. customwas purified by column chromatography