反应详情

n-Butyl lithium (9.44 ml, 2.5N solution in hexanes) was added to a solution of 2-(4-bromophenyl)-4,5-dihydro-4,4-dimethyl-oxazole [A. I. Meyers et al., J.O.C., 1974, 39, 2787] (5 g) in tetrahydrofuran (80 ml) at −78° C. The reddish solution was stirred at −78° C. for 15 minutes before dimethylformamide (2.3 g) was added dropwise. The resulting deep red solution was allowed to warm to room temperature, quenched with ammonium chloride solution and extracted into ether. The combined extracts were washed with brine, dried (sodium sulphate) and evaporated to dryness in vacuo. The residue was purified by column chromatography (30% ethyl acetate/hexane) to afford the title compound as a colourless liquid, 3.01 g.

1. customat −78° C
2. additionwas added dropwise
3. customquenched with ammonium chloride solution
4. extractionextracted into ether
5. washThe combined extracts were washed with brine
6. dry with materialdried (sodium sulphate)
7. customevaporated to dryness in vacuo
8. customThe residue was purified by column chromatography (30% ethyl acetate/hexane)