反应详情

Hydrobromic acid (1.04 mL of a 48 wt % solution in water; 9.18 mmol; 2.0 eq.) was added to a solution of N′-(2-Oxo-1-aza-spiro[4.5]dec-8-yl)-hydrazinecarboxylic acid tert-butyl ester (1.30 g; 4.59 mmol; 1.0 eq.) and 2-Bromo-malonaldehyde (865 mg; 5.51 mmol; 1.2 eq.) in AcOH (13 mL). The reaction mixture was stirred at RT for 2 hour. It was then basified to pH 5 by addition of a 5N NaOH solution and extracted with DCM (three times). Combined organic phases were washed with brine, dried over magnesium sulfate, filtered and concentrated. Purification by autopreparative LC/MS afforded the title compound as the pure cis-isomer (1.0 g, 94%).

1. extractionextracted with DCM (three times)
2. washCombined organic phases were washed with brine
3. dry with materialdried over magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customPurification by autopreparative LC/MS