反应详情

To a mixture of trans-hexahydroisobenzofuran-1,3-dione (2.62 g, 17.01 mmol) and 1-amino-cyclopropanecarbonitrile hydrochloride (2.00 g, 17.01 mmol, (see O'Donnell, M. J., et al., Synthesis, 1984, 127-128) in dichloromethane (100 mL) at −10° C. was added triethylamine (5.22 mL, 37.43 mmol). The reaction mixture was allowed to warm to room temperature overnight. The solvent was evaporated and the residue was dissolved in tetrahydrofuran (80 mL), and cooled to −10° C. Isobutyl chloroformate (2.21 mL), 17.01 mmol) was added. After 15 min., the solution was filtered (20 mL tetrahydrofuran wash) and the filtrates were poured slowly into a solution of NaBH4 (1.28 g, 34.02 mmol) in water (100 mL) at 0° C. The reaction mixture was stirred for 1 h and then saturated aqueous sodium hydrogen carbonate (100 mL) and ethyl acetate (150 mL) were added. The reaction mixture was stirred vigorously for 1 h. The organic phase was separated, washed with brine, the aqueous phases were combined, extracted with ethyl acetate, then the combined organics were dried over anhydrous magnesium sulfate, filtered, and concentrated. The residue was recrystallized from ethyl acetate/hexane to give (1-cyanocyclopropyl)-2-hydroxymethyl-cyclohexane-carboxamide.

1. customThe solvent was evaporated
2. dissolutionthe residue was dissolved in tetrahydrofuran (80 mL)
3. temperaturecooled to −10° C
4. additionIsobutyl chloroformate (2.21 mL), 17.01 mmol) was added
5. filtrationthe solution was filtered
6. wash(20 mL tetrahydrofuran wash)
7. stirringThe reaction mixture was stirred vigorously for 1 h
8. customThe organic phase was separated
9. washwashed with brine
10. extractionextracted with ethyl acetate
11. dry with materialthe combined organics were dried over anhydrous magnesium sulfate
12. filtrationfiltered
13. concentrationconcentrated
14. customThe residue was recrystallized from ethyl acetate/hexane