反应详情

The 6-methylnicotinoyl-acetone which is mentioned as the starting substance in Example 6, can be obtained in a known manner from α-picoline-5-carboxylic acid ethyl ester and acetone, or from 5-acetyl-α-picoline (prepared in accordance with Angew. Ch. 67, page 398) and ethyl acetate: 270 g of 5-acetyl-α-picoline, 5 1 of anhydrous toluene, 387 g. of ethyl acetate and 537 g of potassium tert.-butylate are stirred at 40° for 20 hours and the mixture is subsequently decomposed by means of a mixture of 3 1 of ice water and 288 ml of acetic acid. 283.5 g of 6-methylnicotinoyl-acetone, boiling point 108°-117° /0.2 mm Hg, which rapidly crystallises and, after recrystallisation from ligroin, melts at 57°-58°, is obtained in the usual manner from the toluene solution.