反应详情

In 100 ml of dimethylformamide was dissolved 27.93 g of 2-benzyloxycarbonylamino-5-oxo-2-tetrahydrofurancarboxylic acid prepared by the method described in Journal of Organic Chemistry, 6, 878 (1941). To the solution was added 4.0 g of sodium hydride (60% oil), to which was then added 28.4 g of methyl iodide, followed by allowing the reaction to proceed at room temperature for 4 hours. To the resultant was added 28.4 g of methyl iodide, and the mixture was stirred for further 3 hours. The reaction mixture was added to water, which was subjected to extraction with ethyl acetate. The organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate and a saturated aqueous saline solution, successively, then dried (MgSO4). The solvent was distilled off, and precipitating crystals were collected by filtration, followed by washing with ether to give 27.25 g of methyl 2-benzyloxycarbonylamino-5-oxo-2-tetrahydrofurancarboxylate as colorless crystals, m.p.134°-134.5° C.

1. customprepared by the method
2. customthe reaction
3. extractionwas subjected to extraction with ethyl acetate
4. washThe organic layer was washed with a saturated aqueous solution of sodium hydrogencarbonate
5. dry with materiala saturated aqueous saline solution, successively, then dried (MgSO4)
6. distillationThe solvent was distilled off
7. customprecipitating crystals
8. filtrationwere collected by filtration
9. washby washing with ether