反应详情

Lithium diisopropylamide mono(tetrahydrofuran) (1.5 M in cyclohexane, 22.0 mL, 33.00 mmol) was added to THF (100 mL) at −30° C. and the resulting solution was stirred for 10 min before 3-cyanopropionaldehyde dimethyl acetal (3.90 mL, 29.90 mmol) was added dropwise over 5 min. After 15 min, methyl formate (2.80 mmol, 45.42 mmol) was added and the resulting solution was stirred at −20° C. to −15° C. for 2 h. The reaction mixture was quenched with water (100 mL) and washed with ether (2×50 mL, discarded). The aqueous layer was acidified with 10% HCl and extracted with ether (3×50 mL). The combined ether extracts were washed with brine (3×50 mL), dried (MgSO4), and concentrated. The residue was dissolved in dichloromethane and concentrated to remove traces of THF and provide 2.28 g (49%) of the title compound as a pale yellow oil.

1. additionwas added dropwise over 5 min
2. customThe reaction mixture was quenched with water (100 mL)
3. washwashed with ether (2×50 mL, discarded)
4. extractionextracted with ether (3×50 mL)
5. washThe combined ether extracts were washed with brine (3×50 mL)
6. dry with materialdried (MgSO4)
7. concentrationconcentrated
8. dissolutionThe residue was dissolved in dichloromethane
9. concentrationconcentrated
10. customto remove traces of THF