Methanol → 2-Phenylpropan-2-yl 2,2,2-trichloroacetimidate

Temperature

0 °C

A suspension of 60% sodium hydride in mineral oil (0.42 g, 10.50 mmol) in diethyl ether (10 mL) was treated with the dropwise addition of a solution of 2-phenylpropan-2-ol (12.02 mL, 86 mmol) in diethyl ether (30 mL). Upon completion of addition, the mixture was stirred for 30 minutes, during which time a nearly clear solution was observed. After this time, the mixture was cooled to 0° C. and then treated with the dropwise addition of trichloroacetonitrile (8.18 mL, 82 mmol), which caused the mixture to turn dark brown. The reaction was allowed to warm to room temperature over 1 hour, and then was concentrated in vacuo to yield a residue. The residue was dissolved in hexanes (10 mL) and treated with methanol (0.424 mL, 10.48 mmol), and the resulting mixture was stirred vigorously for 5 minutes. The resulting black suspension was filtered through glass fiberglass filter paper, and the collected solids were rinsed 3× with hexanes. The combined filtrates were concentrated in vacuo to yield 2-phenylpropan-2-yl 2,2,2-trichloroacetimidate (23.8 g, 85 mmol, 99% yield) as an amber oil which was used as-is in the next step.

1. additionUpon completion of addition
2. temperatureto warm to room temperature over 1 hour
3. concentrationwas concentrated in vacuo
4. customto yield a residue
5. stirringthe resulting mixture was stirred vigorously for 5 minutes
6. filtrationThe resulting black suspension was filtered through glass fiberglass
7. filtrationfilter paper
8. washthe collected solids were rinsed 3× with hexanes
9. concentrationThe combined filtrates were concentrated in vacuo

ORD record

ord-952eaeed0fab4cfeac741d18db575c11

Source dataset

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08536198B2