Ammonium Chloride → tert-Butyl 2-hydroxy-2-methylpropylcarbamate

Temperature

-78 °C

Ethyl 2-(tert-butoxycarbonylamino)acetate (4.17 g, 20.52 mmol) was dissolved in tetrahydrofuran (60 ml). The solution was cooled to -78° C. A 22% solution of methyl magensium chloride in toluene/tetrahydrofuran (purchased from Chemmetallgesellschaft, 27.1 ml, 67.72 mmol) was added dropwise. The reaction mixture was stirred for 1.5 h at -78° C. and then warmed to room temperature. A 10% aqueous solution of ammonium chloride (200 ml) was added dropwise. The phases were separated. The aqueous phase was extracted with ethyl acetate (3×100 ml). The combined organic layers were washed with saturated sodium hydrogen carbonate solution (200 ml) and dried over magnesium sulfate. The solvent was removed in vacuo. The crude product was purified by flash chromatography on silica (110 g), using ethyl acetate/heptane (1:1) as eluent, to give 1.31 g of 2-hydroxy-2-methylpropylcarbamic acid tert-butyl ester.

1. temperaturewarmed to room temperature
2. customThe phases were separated
3. extractionThe aqueous phase was extracted with ethyl acetate (3×100 ml)
4. washThe combined organic layers were washed with saturated sodium hydrogen carbonate solution (200 ml)
5. dry with materialdried over magnesium sulfate
6. customThe solvent was removed in vacuo
7. customThe crude product was purified by flash chromatography on silica (110 g)

ORD record

ord-44e068fa5b2f401fafa1f7df1d13e5ba

Source dataset

uspto-grants-2000_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06127391