反应详情

A mixture of 5-bromofuran-2-carboxylic acid (2.64 g, 13.8 mmol), (cyclohexylmethyl)bromide (2.62 g, 14.8 mmol), K2CO3 (2.30 g, 16.64 mmol) in anhydrous NMP was stirred under Ar at +70° C. for 8 hrs after which additional (cyclohexylmethyl)bromide (1.55 g, 8.75 mmol) was added. Stirring continued overnight then the reaction mixture was concentrated under reduced pressure. The residue was partitioned between aqueous NaHCO3 (10%) and hexanes, and then aqueous layer was extracted with hexanes. Combined organic layers were washed with brine, dried over anhydrous MgSO4 and concentrated under reduced pressure to give cyclohexylmethyl 5-bromofuran-2-carboxylate as a light yellow oil. Yield (2.22 g, 56%); 1H NMR (400 MHz, CDCl3) δ 7.10 (d, J=3.9 Hz, 1H), 6.44 (d, J=3.4 Hz, 1H), 4.10 (d, J=6.4 Hz, 2H), 1.64-1.84 (m, 6H), 1.12-1.34 (m, 3H), 0.95-1.09 (m, 2H).

1. additionwas added
2. concentrationthe reaction mixture was concentrated under reduced pressure
3. customThe residue was partitioned between aqueous NaHCO3 (10%) and hexanes
4. extractionaqueous layer was extracted with hexanes
5. washCombined organic layers were washed with brine
6. dry with materialdried over anhydrous MgSO4
7. concentrationconcentrated under reduced pressure