反应详情

Stir a mixture of spiro[2.5]octan-6-one (252 mg, 2.03 mmol), (HCHO)n (61 mg, 2.03 mmol), dimethylamine hydrochloride (166 mg, 2.03 mmol) and 0.3 mL of conc. HCl in MeCN (30 mL) at 60° C. for 6 hours. Quench the reaction with saturated aqueous NH4Cl solution (15 mL). Basify the aqueous solution with K2CO3 to pH=9. Extract the aqueous mixture with EtOAc (30 mL×2). The combined organic layers are washed with brine (15 mL), dried over Na2SO4, filtered, and concentrated under vacuum. Purify the residue by silica gel chromatography (CH2Cl2:MeOH=30:1) to afford 5-Dimethylaminomethyl-spiro[2.5]octan-6-one as brown oil (142 mg, yield: 38.4%). MS (m/z): 182 (M+1).

1. customQuench
2. customthe reaction with saturated aqueous NH4Cl solution (15 mL)
3. extractionExtract the aqueous mixture with EtOAc (30 mL×2)
4. washThe combined organic layers are washed with brine (15 mL)
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under vacuum
8. customPurify the residue by silica gel chromatography (CH2Cl2:MeOH=30:1)