2,2-dimethylpentanedioic acid

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 3 g (0.021 mol) of 2.2-dimethylglutaric anhydride, 2.0 ml (0.019 mol) of benzyl alcohol in 10 ml of CH2Cl2 was added 100 mg of DMAP and 3.4 ml of pyridine. The resulting solution was stired at room temperature for 4 h. After additional 2.2-dimethyl-glutaric acid (0.7 g, 4.9 mmol) was added, the mixture continued to be stirred overnight, then poured into 0.5M H2SO4 (aq.) solution and extracted with CH2Cl2. The organic layer was washed with brine, dried over Na2SO4 and filtered. Concentration followed by purification by flash chromatography on silica gel using EtOAc/hexane (1:1) as the irrigant gave 3.5 g of desired product in 66% yield and 1.2 g of isomer in 23% yield. extracted with CH2Cl2 The organic layer was washed with brine dried over Na2SO4 filtered Concentration followed by purification by flash chromatography on silica gel

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 0.1 mol 2,2-dimethyl-glutaric acid were added 0.3 mol ethanol, 40 ml toluene, and 0.4 ml concentrated sulfuric acid with stirring. The mixture was heated refluxing, and the water produced was removed by using a water separator until the amount of the water separated reached theoretical value. The mixture was neutralized with saturated sodium carbonate solution and extracted with ethyl acetate. The upper layer solution was separated, washed with saturated saline until being neutral, and dried over anhydrous sodium sulfate. After the solvent was removed, distillation under reduced pressure gave diethyl 2,2-dimethylglutarate as a colorless liquid, and the yield was 90%. The mixture was heated refluxing was removed separated extracted with ethyl acetate The upper layer solution was separated washed with saturated saline dried over anhydrous sodium sulfate After the solvent was removed distillation under reduced pressure

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 0.1 mol 2,2-dimethyl-glutaric acid were added 0.3 mol ethanol, 40 ml toluene, and 0.4 ml concentrated sulfuric acid with stirring. The mixture was heated refluxing, and the water produced was removed by using a water separator until the amount of the water separated reached theoretical value. The mixture was neutralized with saturated sodium carbonate solution and extracted with ethyl acetate. The upper layer solution was separated, washed with saturated saline until being neutral, and dried over anhydrous sodium sulfate. After the solvent was removed, distillation under reduced pressure gave diethyl 2,2-dimethylglutarate as a colorless liquid, and the yield was 90%. The mixture was heated refluxing was removed separated extracted with ethyl acetate The upper layer solution was separated washed with saturated saline dried over anhydrous sodium sulfate After the solvent was removed distillation under reduced pressure

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated

Conditions: temp:160.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The mixture of 10 g of 2,2-dimethylglutaric acid and 37.5 g of urea was stirred for 8 hours at 160° C. Into the reaction mixture was added water at 100° C., and the mixture was cooled to near room temperature. The mixture was extracted with ethyl acetate three times. The organic layers were washed with a saturated sodium chloride aqueous solution, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to obtain 7.6 g of 3,3-dimethylpiperidin-2,6-dione. the mixture was cooled to near room temperature The mixture was extracted with ethyl acetate three times The organic layers were washed with a saturated sodium chloride aqueous solution dried over anhydrous magnesium sulfate concentrated