反应详情

To tert-butyl (4aR,8aR)-octahydro-1H-pyrido[3,4-b][1,4]oxazine-1-carboxylate (250 mg, 1.03 mmol) dissolved in DCM (2 mL) was added benzyl chloroformate (0.21 mL, 1.44 mmol). Triethylamine (0.4 mL, 2.89 mmol) was added slowly and stirred for 3 hours at room temperature. The reaction was quenched with saturated aqueous sodium bicarbonate. The aqueous layer was extracted with DCM, and the combined organic layers were dried over sodium sulfate, filtered, and concentrated to afford (4aR,8aR)-6-benzyl 1-tert-butyl hexahydro-1H-pyrido[3,4-b][1,4]oxazine-1,6(7H)-dicarboxylate. 1H NMR (500 MHz, CDCl3) δ 7.40-7.30 (m, 5H), 5.12 (s, 2H), 4.40-4.15 (m, 1H), 3.93-3.87 (m, 1H), 3.86-3.79 (m, 1H), 3.77-3.71 (m, 1H), 3.42-3.29 (m, 2H), 3.19-3.13 (m, 1H), 2.81-2.48 (m, 2H), 1.76-1.66 (m, 1H), 1.58 (s, 2H), 1.45 (s, 9H).

1. customThe reaction was quenched with saturated aqueous sodium bicarbonate
2. extractionThe aqueous layer was extracted with DCM
3. dry with materialthe combined organic layers were dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated