反应详情

A solution of 8-(5-isopropoxy-2-methyl-4-nitrophenyl)-1,4-dioxaspiro[4.5]dec-7-ene (0.1 mmol) in 2.5 mL of TFA and CH2Cl2 (1:4 v/v), is stirred at room temperature for 6 hours. After workup and silica flash chromatography (hexane/EtOAc 4:1), 4-(5-isopropoxy-2-methyl-4-nitrophenyl)cyclohex-3-enone is obtained. 1H NMR (CDCl3, 400 MHz) δ 7.63 (s, 1H), 6.81 (s, 1H), 5.73 (m, 1H), 4.62 (m, 1H), 3.07 (m, 2H), 2.68 (m, 4H), 2.27 (s, 3H), 1.37 (d, 6H). MS (ES+): 290.13 (M+1)+.