反応 #706805
ord-0fa7c5f9fa1e4f8c87f71d696ef899bb
反応方程式
反応物
反応条件
後処理
- 1その他to give a yellow solution
- 2温度This solution was heated to 50° C. for 2 hours
- 3温度cooled to room temperature
- 4その他the reaction quenched by the addition of saturated aqueous NH4Cl
- 5抽出The solution was extracted with EtOAc
- 6洗浄the combined organic layers were washed with H20 and saturated aqueous NaCl
- 7乾燥before being dried (MgSO4)
- 8濃縮concentrated under reduced pressure
実験手順
A solution of bromobenzene (190.0 mg, 1.18 mmol) in 2.0 mL of THF was cooled to -78° C. and tert-butyllithium (151.2 mg, 2.36 mmol, 1.4 mL of a 1.7M solution in pentane) was added to give a yellow solution. After 30 minutes a solution of ZnCl2 (225.0 mg, 1.4 mmol) in 4.0 mL THF was slowly added via cannula. The resulting solution was warmed to room temperature and transferred via cannula to a solution of ethyl 4-(2,2-dimethyl-4-trifluoromethanesulfonyloxy-(2H)-thiochromen-6-ylethynyl)-benzoate (Compound 224, 200.0 mg, 0.40 mmol) and tetrakis(triphenylphosphine)palladium(0) (24.0 mg, 0.02 mmol) in 2.0 mL THF. This solution was heated to 50° C. for 2 hours, cooled to room temperature, and the reaction quenched by the addition of saturated aqueous NH4Cl. The solution was extracted with EtOAc and the combined organic layers were washed with H20 and saturated aqueous NaCl before being dried (MgSO4) and concentrated under reduced pressure. The title compound, 155.0 mg (91%), was isolated by column chromatography (5% EtOAc/hexanes) as a colorless solid. 1H NMR (300 MHz, CDCl3) δ: 7.99 (2H, d, J=8.4 Hz), 7.52 (2H, d, J=8.4 Hz), 7.42-7.24 (8H, m), 5.78 (1H, s), 4.38 (2H, q, J=7.1 Hz), 1.50 (6H, s), 1.40 (3H, t, J=7.1 Hz).