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0 °C

To a solution of 3-hydroxy-pyridine-2-carboxylic acid methyl ester (200 mg, 1.3 mmol) in N,N-dimethylformamide (2.0 ml) was added at 22° C. sodium hydride (55% in oil, 64 mg) and stirring was continued until gas evolution ceased. The suspension was cooled to 0° C. and treated with trifluoroethyl trifluoromethanesulfonate (728 mg) and stirring was continued at 22° C. for 2 hours. The mixture was partitioned between saturated sodium hydrogen-carbonate solution and ethyl acetate, and the organic layer was dried and evaporated. The residue was purified by chromatography on silica using n-heptane and ethyl acetate (3:1) as the eluent to give 3-(2,2,2-trifluoro-ethoxy)-pyridine-2-carboxylic acid methyl ester as a pale green oil. MS (ISP): m/z=236 [M+H]+.

1. stirringstirring
2. customThe mixture was partitioned between saturated sodium hydrogen-carbonate solution and ethyl acetate
3. customthe organic layer was dried
4. customevaporated
5. customThe residue was purified by chromatography on silica