[C:1]([C:5]1[CH:10]=[C:9]([C:11]([CH3:14])([CH3:13])[CH3:12])[CH:8]=[CH:7][C:6]=1[O:15][CH2:16][C:17]([F:20])([F:19])[F:18])([CH3:4])([CH3:3])[CH3:2].[I:21]N1C(=O)CCC1=O.O.C1(C)C=CC(S(O)(=O)=O)=CC=1>ClCCl>[C:1]([C:5]1[CH:10]=[C:9]([C:11]([CH3:13])([CH3:14])[CH3:12])[CH:8]=[C:7]([I:21])[C:6]=1[O:15][CH2:16][C:17]([F:18])([F:19])[F:20])([CH3:2])([CH3:3])[CH3:4]2,4-Di-tert-butyl-1-(2,2,2-trifluoro-ethoxy)-benzene (5.06 g, 17.5 mmol), N-iodosuccinimide (4.74 g, 21 mmol) and p-toluenesulfonic acid monohydrate (1.33 g, 7 mmol) were combined in dichloromethane (50 mL) and heated at 38° C. for 19 h. The reaction was washed with 10% Na2S2O3 solution (2×40 mL). The aqueous was backwashed with dichloromethane (70 mL) and then the combined organic portions washed with water (75 mL) and the combined organic portions washed with water (100 mL), dried (MgSO4), filtered and evaporated in vacuo to provide a yellow oil (6.96 g). The material was purified by flash chromatography using hexane to give 5.85 g (81%) of a light pink oil. 1HNMR (250 MHz, CDCl3): δ 7.67 (d, 1H, J=2.4), 7.37 (d, 1H, J=2.4), 4.45 (q, 2H, J=8.2), 1.40 (s, 9H), 1.30 (s, 9H).
Wird geladen…
