反应详情

A mixture of methyl 3-cyclobutyl-3-oxo-propanoate (4.3 g, 27.53 mmol) and 2,2-dimethylpropanamidine (2.3 g, 22.10 mmol) was stirred in dry MeOH (50 mL) and NaOMe (5.0 g, 92 mmol) was added in portions at 10° C. The suspension was stirred at room temperature overnight. The reaction mixture was concentrated to roughly half of the volume and filtered. The filtrate was extracted with water and DCM. The combined organic layers were washed with brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was stirred with acetone and the precipitate collected, dried under vacuum to give the title compound (3.15 g, 15.27 mmol, 66%).

1. concentrationThe reaction mixture was concentrated to roughly half of the volume
2. filtrationfiltered
3. extractionThe filtrate was extracted with water and DCM
4. washThe combined organic layers were washed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. stirringThe residue was stirred with acetone
9. customthe precipitate collected
10. customdried under vacuum