反应详情

To a suspension of 1-methyl-6-oxo-1,6-dihydro-pyridine-3-carboxylic acid (606 mg) in CH2Cl2 (5 ml) were added one drop of N,N-dimethylformamide and oxalylchloride (803 mg). The mixture was stirred at room temperature for 1.5 h and was then concentrated to dryness. 1,2-Dimethoxyethane was added and the solvent was evaporated again to give the crude acid chloride. To a suspension of zinc powder (517 mg) in 1,2-dimethoxyethane (5 ml) was added tetrakis(triphenylphosphine)palladium(0) (55 mg). A suspension of the acid chloride in 1,2-dimethoxyethane (5 ml) was added. The mixture was cooled in an ice bath and a solution of 4-bromo-1-bromomethyl-2-chloro-benzene (1.125 g) in 1,2-dimethoxyethane (5 ml) was slowly added over 30 min. The mixture was stirred for 30 min at 0° C. and for 1.5 h at room temperature. The mixture was filtered and the filtrate was concentrated. The product was purified by chromatography (SiO2, cyclohexane/EtOAc 7:3=>0:1) to give the title compound (603 mg, not completely pure) as a colorless solid. MS (m/e, ISP neg. ion)=338.0 [M−H+].

1. concentrationwas then concentrated to dryness
2. addition1,2-Dimethoxyethane was added
3. customthe solvent was evaporated again
4. customto give the crude acid chloride
5. additionwas added
6. temperatureThe mixture was cooled in an ice bath
7. stirringThe mixture was stirred for 30 min at 0° C. and for 1.5 h at room temperature
8. filtrationThe mixture was filtered
9. concentrationthe filtrate was concentrated
10. customThe product was purified by chromatography (SiO2, cyclohexane/EtOAc 7:3=>0:1)