反应详情

A solution of 1-Aza-spiro[4.5]decane-2,8-dione (Chembridge corporation, 800 mg; 4.78 mmol; 1.0 eq.) and hydrazinecarboxylic acid tert-butyl ester (309 mg; 2.34 mmol; 1.1 eq.) in AcOH (5 mL) was stirred at RT for 5 min. Sodium cyanoborohydride (133 mg; 2.13 mmol; 1.0 eq.) was then added and the reaction mixture was stirred O/N at RT. It was then diluted with water and basified to pH 9 by addition of a 5N solution of NaOH. During the addition, the reaction mixture was maintained at 20° C. by addition of crushed ice. It was extracted with DCM and the combined organic phases were washed with brine, dried over magnesium sulfate, filtered and concentrated to give the title compound as a yellow oil (1.0 g, 98%) which was used without further purification.

1. additionDuring the addition
2. temperaturethe reaction mixture was maintained at 20° C. by addition of crushed ice
3. extractionIt was extracted with DCM
4. washthe combined organic phases were washed with brine
5. dry with materialdried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated