反应详情

温度

-20 °C

A solution of 27 gm of isopropylcyclohexylamine in 200 ml of dry tetrahydrofuran (THF) was cooled to -20° C. under argon and treated with 115 ml of 1.6M n-butyl lithium in hexane. The solution was stirred for about 30 min. at -20° C. and then cooled to -70° C. A solution of 14 grams of methyl cyclobutane carboxylate in 100 ml of THF was added dropwise over a one hour period. After the addition was complete, the solution was allowed to warm to near 0° C. and 33 grams of methyl iodide was added rapidly. The reaction mixture was allowed to warm to room temperature and then was poured into a mixture of ether and 1N HCl. The organic layer was separated and combined with a subsequent ethyl acetate extraction of the aqueous layer. The combined organic extracts were washed with dilute sodium sulfite solution, twice with water and dried over sodium sulfate. The solvent was removed by distillation at atmospheric pressure, and the residue was distilled under reduced pressure to give 11.4 grams of methyl 1-methylcyclobutane carboxylate.

1. temperaturecooled to -70° C
2. additionAfter the addition
3. temperatureto warm
4. customto near 0° C.
5. temperatureto warm to room temperature
6. customThe organic layer was separated
7. extractioncombined with a subsequent ethyl acetate extraction of the aqueous layer
8. washThe combined organic extracts were washed with dilute sodium sulfite solution, twice with water
9. dry with materialdried over sodium sulfate
10. customThe solvent was removed by distillation at atmospheric pressure
11. distillationthe residue was distilled under reduced pressure