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.

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)