METHYL 2-(METHYLANILINO)-2-OXOACETATE

反应条件: temp:-70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a stirred solution of 2.5 g(0.011 mole) of 2-(5-isopropyl-5-methyl-4-oxo-2-imidazolin-2 -yl)-5-methyl pyridine in 100ml of anhydrous tetrahydrofuran cooled to -70° C. under the presence of nitrogen was added dropwise a 9.68 ml of 2.5 molar n-butyllithium, thus maintaining temperature below -65° C. The solution was stirred at -70° C. for 3 hr and a solution 1.96 g of N-methyl-N-phenyl oxamic acid methyl ester(3.4 g, 0.016 mole) in 10 ml of anhydrous tetrahydrofuran was added dropwise while maintaining temperature below -65° C. After stirring another hour at -70° C., the solution was poured into water and extracted with methylene chloride. The combined organic phases were dried over anhydrous magnesium sulfate, filtered, and concentrated under reduced pressure to give crude product. The crude product was purified by column chromatography to produce 1.76 g of pale yellow solid(m.p.=153°~156° C.). thus maintaining temperature below -65° C while maintaining temperature below -65° C After stirring another hour at -70° C. extracted with methylene chloride The combined organic phases were dried over anhydrous magnesium sulfate filtered concentrated under reduced pressure to give crude product The crude product was purified by column chromatography