4,4-二甲基-5H-1,3-恶唑

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

实验步骤: To 8-phenyloctylmagnesium bromide (from 24.25 mmol of 8-phenyloctyl bromide and 21.27 mmol of magnesium) in distilled tetrahydrofuran (40 ml) was added 2-(2-methoxyphenyl)-4,4-dimethyloxazoline (17.10 mmol) [A. I. Meyers et al., J. org. Chem., 43, 1372 (1978)] in tetrahydrofuran (20 ml). After stirring for 24 hours, the reaction mixture was worked up to yield 2-12-(8-phenyloctyl)phenyl]-4,4-dimethyloxazoline as an oil. A solution of the oxazoline (11.58 mmol) in methyl iodide (20 ml) was refluxed under argon for 18 hours. Removal of the volatiles afforded the corresponding 3,4,4-trimethyloxazolinium iodide as a white solid (mp 76.5°-78° C.). Removal of the volatiles

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

实验步骤: A mixture of 6-methylpyridine-2-carboxylic acid (13.7 g, 100 mmol) and thionyl chloride (40 ml) was stirred at 70° C. for 1 hour. The mixture was dried, and dichloromethane (40 ml) was added to the residue. The solution was added to a dichloromethane solution of 2-amino-2-methyl-propanol (36.0 g, 400 mmol), and stirred. The mixture was washed with water, and dried over anhydrous magnesium sulfate. The extract was concentrated and chromatographed on silica gel to give an amide compound. 4,4-Dimethyl-2-oxazoline compound was obtained by reacting the amide compound and thionyl chloride in dichloromethane. 4,4-Dimethyl-2-oxazoline compound was reacted with n-butyl lithium at -78° C. in anhydrous tetrahydrofuran, and chloroethyl phenyl ether (782 mg, 5 mmol) was added. Purified alkylated compound was treated with ethanol saturated with HCl to give ethyl 6-(3-chloropropyl)pyridine-2-carboxylate. Purified was treated with ethanol saturated with HCl

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

实验步骤: A mixture of 6-methylpyridine-2-carboxylic acid (13.7 g, 100 mmol) and thionyl chloride (40 ml) was stirred at 70° C. for 1 hour. The mixture was dried, and dichloromethane (40 ml) was added to the residue. The solution was added to a dichloromethane solution of 2-amino-2-methyl-propanol (36.0 g, 400 mmol), and stirred. The mixture was washed with water, and dried over anhydrous magnesium sulfate. The extract was concentrated and chromatographed on silica gel to give an amide compound. 4,4-Dimethyl-2-oxazoline compound was obtained by reacting the amide compound and thionyl chloride in dichloromethane. 4,4-Dimethyl-2-oxazoline compound was reacted with n-butyl lithium at -78° C. in anhydrous tetrahydrofuran, and chloroethyl phenyl ether (782 mg, 5 mmol) was added. Purified alkylated compound was treated with ethanol saturated with HCl to give ethyl 6-(3-chloropropyl)pyridine-2-carboxylate. Purified was treated with ethanol saturated with HCl

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

实验步骤: To 8-phenyloctylmagnesium bromide (from 24.25 mmol of 8-phenyloctyl bromide and 21.27 mmol of magnesium) in distilled tetrahydrofuran (40 ml) was added 2-(2-methoxyphenyl)-4,4-dimethyloxazoline (17.10 mmol) [A. I. Meyers et al., J. org. Chem., 43, 1372 (1978)] in tetrahydrofuran (20 ml). After stirring for 24 hours, the reaction mixture was worked up to yield 2-12-(8-phenyloctyl)phenyl]-4,4-dimethyloxazoline as an oil. A solution of the oxazoline (11.58 mmol) in methyl iodide (20 ml) was refluxed under argon for 18 hours. Removal of the volatiles afforded the corresponding 3,4,4-trimethyloxazolinium iodide as a white solid (mp 76.5°-78° C.). Removal of the volatiles

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

实验步骤: A mixture of 6-methylpyridine-2-carboxylic acid (13.7 g, 100 mmol) and thionyl chloride (40 ml) was stirred at 70° C. for 1 hour. The mixture was dried, and dichloromethane (40 ml) was added to the residue. The solution was added to a dichloromethane solution of 2-amino-2-methyl-propanol (36.0 g, 400 mmol), and stirred. The mixture was washed with water, and dried over anhydrous magnesium sulfate. The extract was concentrated and chromatographed on silica gel to give an amide compound. 4,4-Dimethyl-2-oxazoline compound was obtained by reacting the amide compound and thionyl chloride in dichloromethane. 4,4-Dimethyl-2-oxazoline compound was reacted with n-butyl lithium at -78° C. in anhydrous tetrahydrofuran, and chloroethyl phenyl ether (782 mg, 5 mmol) was added. Purified alkylated compound was treated with ethanol saturated with HCl to give ethyl 6-(3-chloropropyl)pyridine-2-carboxylate. Purified was treated with ethanol saturated with HCl