反应详情

To a solution of 46 (0.69 g, 3.17 mmol) in THF:MeOH:H2O (1:1:1) (9 mL) was added LiOH.H2O (0.25 g, 5.96 mmol). The reaction was stirred at rt for 16 h, diluted with water, acidified to pH 3 with 1 N HCl, and extracted with EtOAc. The combined organic layers were washed with water, brine, dried over MgSO4, and concentrated in vacuo to provide 0.58 g (90%) of product 47 as an off-white solid. 1H NMR (300 MHz, DMSO-d6) δ 2.35 (s, 3H), 2.65 (t, J=8 Hz, 2H), 2.93 (t, J=8 Hz, 2H), 6.05 (s, 1H), 6.75 (d, J=8 Hz, 1H), 7.04 (s, 1H), 7.27 (d, J=8 Hz, 1H), 10.74 (brs, 1H), 12.19 (brs, 1H). LC-MS (CI): m/z 202.0 [(M−H)− C12H13NO2 requires 203.09].

1. extractionextracted with EtOAc
2. washThe combined organic layers were washed with water, brine
3. dry with materialdried over MgSO4
4. concentrationconcentrated in vacuo