反应详情

温度

40 °C

tert-Butyl 3-(3-methyl-1,2,4-oxadiazol-5-yl)piperidine-1-carboxylate 2a,b (0.81 g, 0.0030 mol) was dissolved in 5 mL dichloromethane. Hydrochloric acid in ethanol (2.5 M) (2.43 mL, 0.0060 mol) was added and the mixture was heated to 40° C. for 3 hours. 20 mL of MTBE was added and the product precipitated from solution. The solids were filtered and washed with 3×5 mL MTBE and dried under vacuum overnight to obtain 574 mg of a white solid in 94% yield. MS (ESI) m/z 168 [M+1]+. 1H NMR (DMSO-d6) δ 1.74-1.82 (m, 3H), 2.11-2.14 (d, 1H), 2.31 (s, 3H), 2.87 (t, 1H), 3.10-3.30 (m, 2H), 3.49-3.56 (m, 3H).

1. customthe product precipitated from solution
2. filtrationThe solids were filtered
3. washwashed with 3×5 mL MTBE
4. customdried under vacuum overnight