Hydrogen Peroxide → 2(1H)-Pyridinone, 3-(trifluoromethyl)-

0.19 g (2.0 mmol) of 2-hydroxypyridine and 0.11 g (0.6 mmol) of ferrocene were weighed and placed in a two-neck flask and the atmosphere in the flask was replaced with argon. The following materials were added thereinto: 8.0 ml of dimethyl sulfoxide, 2.0 ml of a 3.0 mol/l dimethyl sulfoxide solution of trifluoromethyl iodide and 0.4 ml of a 30% hydrogen peroxide aqueous solution, and the mixture was stirred for 20 minutes. During the stirring, the temperature of the reaction system rose up in the range of from 40° C. to 50° C. Thereafter, the resulting solution was cooled to room temperature. Formation of 2-hydroxy-3-trifluoromethylpyridine (19F-NMR yield: 64%) was confirmed by 19F-NMR with 2,2,2-trifluoroethanol as an internal standard. The subsequent procedure was conducted in the same manner as in Example 1 and 2-hydroxy-3-trifluoromethylpyridine was obtained as a white solid (0.081 g, yield: 50%).

1. customplaced in a two-neck flask
2. additionThe following materials were added
3. customrose up in the range of from 40° C. to 50° C

ORD record

ord-c2cc8d41c4654f10b5c52c55fc37f493

Source dataset

uspto-grants-2011_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07981318B2