Hydrochloric Acid → 8-Tert-butyl-10-ethyl-11-oxa-3,8-diazaspiro[5.5]undecane

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Reaction Steps

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).

Provenance & Evidence