反应详情

To a four-necked flask equipped with a thermometer, a stirrer and a Deanstark trap were added 27 g (0.1 mole) of N-(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)glycine methyl ester, 21.9 g (0.11 mole) of 1-acetyl-2,2,6,6-tetramethyl-4-piperidinol, 0.23 g of lithium amide and 100 g of heptane. The temperature was raised with stirring, and reaction was carried out at 98° to 105° C. for 6 hours, during which methanol was removed from the reaction system by means of the Deanstark trap. After completion of the reaction, the reaction solution was cooled, and water was added thereto to dissolve the product in the heptane layer. The heptane layer was separated and concentrated by removing heptane by distillation. The residue was purified by column chromatographic separation to obtain 32 g of N-(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)glycine(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)ester as a pale yellow liquid. Yield, 73% based on N-(1-acetyl-2,2,6,6-tetramethyl-4-piperidinyl)-glycine methyl ester.

1. customTo a four-necked flask equipped with a thermometer, a stirrer
2. temperatureThe temperature was raised
3. customreaction
4. customwas removed from the reaction system by means of the Deanstark trap
5. customAfter completion of the reaction
6. temperaturethe reaction solution was cooled
7. customThe heptane layer was separated
8. concentrationconcentrated
9. customby removing heptane
10. distillationby distillation
11. customThe residue was purified by column chromatographic separation