反应详情

A 50% solution of TFA in CH2Cl2 (200 mL) was added to 5-bromo-2-[N-(tert-butoxycarbonyl)-N-(methoxycarbonylmethyl)amino]pyridine (16.5 g, 46 mmole). After stirring for 45 min the reaction was concentrated to dryness, and the residue was diluted with 1.0 N Na2CO3 (300 mL). The mixture was extracted with EtOAc (300 mL), and the organic layer was washed with brine, dried (Na2SO4), and concentrated to dryness under vacuum. The title compound (11.32 g, 100%) was obtained as a white solid: 1H NMR (400 MHz, CDCl3) δ 8.13 (d, J=2.3 Hz, 1 H), 7.48 (dd, 1 H), 6.40 (d, J=8.8 Hz, 1 H), 4.95 (br s, 1 H), 4.12 (d, J=5.5 Hz, 2 H), 3.78 (s, 3H).

1. concentrationwas concentrated to dryness
2. additionthe residue was diluted with 1.0 N Na2CO3 (300 mL)
3. extractionThe mixture was extracted with EtOAc (300 mL)
4. washthe organic layer was washed with brine
5. dry with materialdried (Na2SO4)
6. concentrationconcentrated to dryness under vacuum