反应详情

To a solution of (1,1-dimethylethyl)(dimethyl){[(3-{[(methyloxy)methyl]oxy}phenyl)methyl]oxy}silane (Intermediate 103, 3 g) in dry n-hexane (30 mL) a solution of BuLi in hexane (1.6M, 7.63 mL, 12.21 mmol) was added and the reaction mixture was stirred for 2 hours at room temperature The reaction mixture was cooled to −78° C. and it was added (via cannulation) to a solution of ethyl chloro(oxo)acetate (1.780 mL, 15.93 mmol) in dry tetrahydrofuran (20 mL) at −78° C. The reaction was quenched with water (20 ml) and extracted with ethyl acetate (2×30 ml). The organic layer was dried over sodium sulphate, filtered and evaporated and the residue was purified by flash chromatography (Biotage system) on silica gel using a 100 g SNAP column and cyclohexane to cyclohexane/ethyl acetate 8:2 as eluents. This afforded the title compound as a yellow pale oil (2.67 g).

1. temperaturewas cooled to −78° C.
2. customThe reaction was quenched with water (20 ml)
3. extractionextracted with ethyl acetate (2×30 ml)
4. dry with materialThe organic layer was dried over sodium sulphate
5. filtrationfiltered
6. customevaporated
7. customthe residue was purified by flash chromatography (Biotage system) on silica gel using a 100 g SNAP column and cyclohexane to cyclohexane/ethyl acetate 8:2 as eluents