反应详情

2 M of isopropylmagnesium chloride in THF (300 mL) was added to a −78° C. solution of cyanoacetic acid (28.3 g, 333 mmol) in anhydrous THF (600 mL, 7000 mmol). After 1 h, a solution of 4-chlorophenylacetic acid (20 g, 100 mmol) and N,N-carbonyldiimidazole (21.7 g, 134 mmol) in anhydrous THF (200 mL, 2000 mmol) was added. The reaction mixture was warmed to rt. After 16 h, the reaction mixture was poured into water (1 L, 60000 mmol). The mixture was adjusted to pH 4 with glacial AcOH. Gas evolution was evident during addition of the AcOH. The mixture was concentrated in vacuo to remove the THF (in 1 L portions). The product crystallized from the aqueous portions. The solid was collected by filtration, washing with water. Dried under vacuum to afford the product as a fluffy light orange-yellow solid (15.89 g, 60%).

1. waitAfter 16 h
2. concentrationThe mixture was concentrated in vacuo
3. customto remove the THF (in 1 L portions)
4. customThe product crystallized from the aqueous portions
5. filtrationThe solid was collected by filtration
6. washwashing with water
7. customDried under vacuum