反应详情

1-[4-(3,4-Dichloro-benzyloxy)-phenyl]-ethane-1,2-diol (18.8 g), imidazole (8.17 g), and a catalytic amount of DMAP were dissolved in 60 mL of anhydrous DMF. tert-Butyldiphenylchlorosilane (18.7 mL) was added drop-wise and the mixture stirred at rt for 16 h. The reaction mixture was poured into 1 L of a mixture of water-ethyl acetate-hexanes (2:2:1) and the layers were separated. After an additional extraction with 0.5 L 3:1 EtOAc/hexanes, the organic extracts were dried over sodium sulfate and concentrated. The yellow oil was purified by silica gel flash chromatography (ethyl acetate/hexanes) to give 14.0 g of the desired product. 1H NMR (400 MHz, CDCl3): 7.65 (m, 4H), 7.52 (m, 1H), 7.34-7.46 (m, 7H), 7.22 (m, 3H), 6.88 (d, 2H), 5.0 (s, 2H), 4.78 (m, 1H), 3.6-3.8 (m, 2H), 3.05 (m, 1H), 1.10 (s, 9H).

1. customthe layers were separated
2. extractionAfter an additional extraction with 0.5 L 3:1 EtOAc/hexanes
3. dry with materialthe organic extracts were dried over sodium sulfate
4. concentrationconcentrated
5. customThe yellow oil was purified by silica gel flash chromatography (ethyl acetate/hexanes)