反应详情

温度

55 °C

To a solution of tert-butyl 10-benzyl-8-vinyl-7-oxa-3,10-diazaspiro[5.5]undecane-3-carboxylate (3.10 g, 8.32 mmol) in methanol (60 mL) was added Pd(OH)2 (1.40 g, 9.99 mmol) and ammonium formate (10.5 g, 166 mmol) and the mixture heated at 55° C. for 20 min. The reaction mixture was filtered, concentrated to ˜10 mL, then diluted with dichloromethane and saturated sodium bicarbonate solution. The organic layer was separated and the aqueous layer extracted with dichloromethane (5×20 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo to provide tert-butyl 4-ethyl-5-oxa-2,9-diazaspiro[5.5]undecane-9-carboxylate (2.27 g, 7.99 mmol, 96%). ESI-MS m/z calc. 284.21. found 285.1 (M+1)+; Retention time: 1.09 minutes (3 min run).

1. filtrationThe reaction mixture was filtered
2. concentrationconcentrated to ˜10 mL
3. additiondiluted with dichloromethane and saturated sodium bicarbonate solution
4. customThe organic layer was separated
5. extractionthe aqueous layer extracted with dichloromethane (5×20 mL)
6. dry with materialThe combined organic layers were dried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated in vacuo