Triethylamine → 2-(1-Azidoethyl)-5-fluoropyrimidine

Temperature

0 °C

A round-bottom flask containing 1-(5-fluoropyrimidin-2-yl)ethanol (Method 74, 0.79 g, 5.55 mmol) was charged with triethylamine (0.67 g, 6.66 mmol) and anhydrous DCM (10 ml). The solution was cooled to 0° C., and methanesulfonyl chloride (0.70 g, 4.1 mmol) was added dropwise. The resulting mixture was allowed to stir at room temperature for 2 hours, at which point the volatile components were removed using a rotary evaporator. The residue was dissolved in DMF (15 ml) and treated with sodium azide (0.72 g, 11.1 mmol). The resulting mixture was stirred at room temperature for 60 hours. It was then partitioned between EtOAc and brine. The organic layer was obtained, dried (Na2SO4), and evaporated to dryness. The crude material was purified by silica gel chromatography (by ISCO Combiflash with gradient EtOAc and hexanes) to afford the title compound as a colourless oil (0.60 g, 65% yield over two steps). GC-MS, 167 (M), 138 (M-N2), 125 (M-N3); 1H NMR (CDCl3) δ 8.60 (s, 2H), 4.60 (m, 1H), 1.65 (d, 3H).

1. customwere removed
2. customa rotary evaporator
3. dissolutionThe residue was dissolved in DMF (15 ml)
4. stirringThe resulting mixture was stirred at room temperature for 60 hours
5. customIt was then partitioned between EtOAc and brine
6. customThe organic layer was obtained
7. dry with materialdried (Na2SO4)
8. customevaporated to dryness
9. customThe crude material was purified by silica gel chromatography (by ISCO Combiflash with gradient EtOAc and hexanes)

ORD record

ord-20786a412664458f82c54b0d73b46300

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08324252B2