反応 #706816

反応方程式

ethyl 4-[[4-(4-ethylphenyl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoate

Compound 227

ethyl 4-[[4-(4-ethylphenyl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoate

NaOH

HCl

→

title compound

収率 89.0%

4-[[4-(4-ethylphenyl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethyl]-benzoic acid

収率 89.0%

溶媒

THF

EtOH

反応条件

後処理

1. 1
   抽出extracted with EtOAc
2. 2
   洗浄The combined organic layers were washed with H2O, saturated aqueous NaCl
3. 3
   乾燥dried (Na2SO4)
4. 4
   その他before removing the solvent under reduced pressure
5. 5
   その他The residual solid was recrystallized from CH3CN

実験手順

To a solution of ethyl 4-[[4-(4-ethylphenyl)-2,2-dimethyl-(2H)-thiochromen-6-yl]-ethynyl]-benzoate (Compound 227, 940.0 mg, 2.08 mmol) in 10.0 mL THF and 5.0 mL EtOH was added NaOH (416.0 mg, 10.4 mmol, 5.2 mL of a 2M aqueous solution). The resulting solution was stirred overnight at room temperature. The reaction mixture was acidified with 10% aqueous HCl and extracted with EtOAc. The combined organic layers were washed with H2O, saturated aqueous NaCl, and dried (Na2SO4) before removing the solvent under reduced pressure. The residual solid was recrystallized from CH3CN to give 786.0 mg (89%) of the title compound as a colorless solid. 1H NMR (300 MHz, d6 -acetone) δ: 8.01 (2H, d, J=8.3 Hz), 7.60 (2H, d, J=8.5 Hz), 7.42 (2H, m), 7.29 (2H, m), 7.22 (3H, m), 5.94 (1H, s), 2.69 (2H, q, J=7.7 Hz), 1.47 (6H, s), 1.25 (3H, t, J=7.7 Hz).

出典