反应详情

Potassium tert-pentylate (25% in toluene, 11.3 mL, 20 mmol) was added dropwise to a solution of phenylacteonitrile (590 mg, 5.0 mmol, [CAS Reg. No. 140-29-4]) in THF (8 mL). After 45 min, 2-methyl-isonicotinic acid ethyl ester (998 mg, 6.0 mmol, [CAS Reg. No. 25635-17-0]) was added drop wise, and the mixture was stirred for 3 h at r.t. The solvent was evaporated, and the residue was taken up in ethyl acetate, and washed with 1N aqueous HCl. The combined water layers were saturated with NaCl, and the crude title compound (as an orange precipitate) was collected by filtration. Evaporation of the organic layer gave an additional small crop of crude product. The combined material (1.02 g, 85%) was used in the next step without further purification. 1H NMR (300 MHz, DMSO-D6) □ 8.81 (1H, d), 7.94 (1H, s), 7.86 (1H, d), 7.78 (2H, d), 7.44 (2H, dd), 7.33 (1H, d), 2.71 (3H, s); MS (m/e)=237.1 [MH+].

1. addition25635-17-0]) was added drop wise
2. customThe solvent was evaporated
3. washwashed with 1N aqueous HCl
4. filtrationthe crude title compound (as an orange precipitate) was collected by filtration
5. customEvaporation of the organic layer
6. customgave an additional small crop of crude product
7. customThe combined material (1.02 g, 85%) was used in the next step without further purification