反应详情

Ethyl (2E)-5-(tert-butoxycarbonylamino)-5-methylhex-2-enoate (1.233 g, 4.54 mmol) was dissolved in dioxane (20 ml). Lithium hydroxide (0.120 g, 5.00 mmol) was added as a solid. Water (10 ml) was added, until a clear solution was reached. The solution was stirred 16 h at room temperature. The solution was diluted with water (70 ml) and was extracted with tert-butyl methyl ether (2×100 ml). The aqueous phase was acidified with 1N sodium hydrogensulfate solution (pH=1) and was extracted with tert-butylmethylether (3×70 ml). The organic phases were combined and dried over magnesium sulfate. The solvent was removed in vacuo to give 1.05 g of (2E)-5-(tert-butoxycarbonylamino)-5-methylhex-2-enoic acid. The crude product was used for further syntheses.

1. extractionwas extracted with tert-butyl methyl ether (2×100 ml)
2. extractionwas extracted with tert-butylmethylether (3×70 ml)
3. dry with materialdried over magnesium sulfate
4. customThe solvent was removed in vacuo