反应详情

4 N HCl (4.23 mL, 16.9 mmoles) was added to a solution of 8-((4-bromophenoxy)difluoromethyl)-1,4-dioxaspiro[4.5]decane (1230 mg, 3.387 mmoles) in acetone (11.3 mL, 0.3M) and was allowed to stir overnight at room temperature. The reaction mixture was concentrated onto silica gel and purified via chromatography (9:1 heptane:ethyl acetate to 3:7 heptane:EtOAc over 40 minutes followed by 100% EtOAc for 10 minutes) afforded the desired material (1081 mg, 97.13%). 1H NMR (400 MHz, METHANOL-d4) δ ppm 1.27 (br. s., 2 H) 1.39-1.51 (m, 2 H) 1.96-2.10 (m, 5 H) 3.32-3.38 (m, 0 H) 3.47-3.55 (m, 1 H) 7.05-7.13 (m, 2 H) 7.45-7.53 (m, 2 H)

1. concentrationThe reaction mixture was concentrated onto silica gel
2. custompurified via chromatography (9:1 heptane:ethyl acetate to 3:7 heptane:EtOAc over 40 minutes followed by 100% EtOAc for 10 minutes)