反应详情

Di-tert-butyliminodicarboxylate (3.05 g, 14.07 mmol) and potassium tert-butoxide (1.58 g, 14.07 mmol) were stirred in DMF (50 mL) for 15 minutes followed by the addition of 1-(4-(2-(2-(2-iodoethoxy)ethoxy)ethoxy)phenyl)butan-1-one (43; 3.81 g, 9.38 mmol). The resulting mixture was stirred under nitrogen for 18 hours, and then poured into 200 mL of ethyl acetate. This solution was washed with water (2×) and sat. brine, dried over sodium sulfate, and concentrated to afford a liquid that was purified by flash silica gel column chromatography, eluting with 3:1 hexanes/ethyl acetate to afford 44 (2.27 g, 49%) as a clear oil: MS (ES+) m/z 496.2 (M+H)+.

1. washThis solution was washed with water (2×) and sat. brine
2. dry with materialdried over sodium sulfate
3. concentrationconcentrated
4. customto afford a liquid that
5. customwas purified by flash silica gel column chromatography
6. washeluting with 3:1 hexanes/ethyl acetate