反应详情

温度

0 °C

Trimethylaluminium (2M in toluene) (0.993 mL, 1.99 mmol) was added to 5-methylpyridin-2-amine (205 mg, 1.90 mmol) in toluene (10 mL) cooled to 0° C. under nitrogen. The resulting solution was stirred at 0° C. for 10 minutes. (S)-methyl 3-(3-(tert-butyldimethylsilyloxy)azetidin-1-yl)-2-hydroxypropanoate (Intermediate AD3) (500 mg, 1.73 mmol) in toluene (4 mL) was added and the reaction was allowed to warm to room temperature and then heated at 80° C. for 4 hours. The reaction mixture was concentrated in vacuo. The residue was neutralised with citric acid (1M, aq) and then diluted with water and extracted with EtOAc. The combined organics were dried (MgSO4) and evaporated to afford the product (482 mg, 76%). 1H NMR (400 MHz, CDCl3) δ 0.05 (6H, s), 0.88 (9H, s), 2.30 (3H, s), 3.15-3.23 (1H, m), 3.37-3.51 (3H, m), 4.15-4.30 (2H, m), 4.32-4.39 (1H, m), 4.58-4.66 (1H, m), 7.48-7.53 (1H, m), 8.04 (1H, d), 8.12-8.15 (1H, m), 9.46 (1H, s); m/z (ES+) (M+H)+=366.53; HPLC tR=1.50 min.

1. temperatureto warm to room temperature
2. temperatureheated at 80° C. for 4 hours
3. concentrationThe reaction mixture was concentrated in vacuo
4. additiondiluted with water
5. extractionextracted with EtOAc
6. dry with materialThe combined organics were dried (MgSO4)
7. customevaporated