反应详情

According to the procedure of L. Florvall et al. J. Med. Chem. 29, 1406 (1986), a solution of KOH (0.75 g) in ethanol (5 mL) was added to a mixture of 2-fluoro-6-nitrotoluene (77.5 g, 0.5 mole) and paraformaldehyde (15 g, 0.5 mole) in DMSO (75 mL). The dark solution was stirred for 3 days at room temperature, diluted with water (1.2 L), neutralized with 2.5N HCl (to pH 6.5) and extracted with ether (3×). The extracts were washed with brine (1×), dried (MgSO4) and evaporated to dryness to yield a yellow solid. Trituration with light petroleum ether removed a small amount of unreacted starting material and provided 2-fluoro-6-nitrophenethyl alcohol as a pale yellow solid, 82.3 g, 89.3%, m.p. 42°-44° C. This material was used for the subsequent reaction without further purification. An analytical sample was purified by flash chromatography (silica Merck-60, hexane-ether 6:4), m.p. 45°-46° C.

1. extractionextracted with ether (3×)
2. washThe extracts were washed with brine (1×)
3. dry with materialdried (MgSO4)
4. customevaporated to dryness
5. customto yield a yellow solid
6. customTrituration with light petroleum ether removed a small amount