反应详情

After 840 mg (19.3 mmol) of 55% sodium hydride were washed with hexane, it was suspended in 40 ml of dimethylformamide, and 3.00 g (22.7 mmol) of 2,2,3,3-tetrafluoropropanol were gradually added to the suspension at 0° C. under a nitrogen atmosphere. When generation of hydrogen gas stopped, a solution in which 3.40 g (18.3 mmol) of ethyl 6-chloronicotinate was dissolved in 15 ml of dimethylformamide was added dropwise to the resulting mixture at the same temperature for about 30 minutes. After the dropwise addition, the mixture was stirred for 30 minutes and the reaction mixture was poured into ice-water, followed by extraction with benzene. After the extract was dried, the solvent was distilled off and the thus obtained oil was purified over column chromatography [eluted with a mixed solvent of benzene-hexane (1:1)] using silica gel to obtain 4.42 g (yield: 86%) of the title compound as an oil.

1. additionwas added dropwise to the resulting mixture at the same temperature for about 30 minutes
2. additionAfter the dropwise addition
3. extractionfollowed by extraction with benzene
4. customAfter the extract was dried
5. distillationthe solvent was distilled off
6. customthe thus obtained oil was purified over column chromatography [
7. washeluted with a mixed solvent of benzene-hexane (1:1)]