反应详情

Tert-butyl 8-tert-butyl-10-ethyl-11-oxa-3,8-diazaspiro[5.5]undecane-3-carboxylate (530 mg, 1.56 mmol) was dissolved in dichloromethane and treated with a solution of HCl in dioxane (8.0 mL of 4 M, 33 mmol) and stirred for 15 min. The reaction mixture was diluted with dichloromethane and washed with 1:1 saturated NaHCO3/1 M NaOH. The organic layer was dried over Na2SO4, filtered and concentrated to provide 8-tert-butyl-10-ethyl-11-oxa-3,8-diazaspiro[5.5]undecane (390 mg, 99%) as an oily solid. ESI-MS m/z calc. 240.2. Found 241.3 (M+1)+; Retention time: 0.21 minutes (3 min run).

1. washwashed with 1:1 saturated NaHCO3/1 M NaOH
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated