反应详情

温度

0 °C

To a suspension of methyltriphenylphosphonium bromide (8.78 g, 24.6 mmol) in dry tetrahydrofuran (50 ml) at 0° C. KHMDS 0.5M solution in toluene (44.22 ml, 22.11 mmol) was slowly added and the reaction mixture was stirred for 15 minutes at 0° C. and for 45 minutes at room temperature. The reaction mixture was cooled to 0° C. and it was slowly added to a solution of ethyl 2-[2,6-bis(methoxymethoxy)-3-methyl-phenyl]-2-oxo-acetate (Intermediate 151, 4.6 g, 14.74 mmol) in dry tetrahydrofuran (25 mL) at 0° C. and the reaction mixture was stirred for 2 hours at 0° C. The reaction was quenched with water (50 ml), diluted with brine (50 ml) and extracted with ethyl acetate (2×100 ml). The organic layer was dried over sodium sulphate, filtered and evaporated. 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 affording the title compound (3.8 g) as a colourless oil.

1. temperatureThe reaction mixture was cooled to 0° C.
2. stirringthe reaction mixture was stirred for 2 hours at 0° C
3. customThe reaction was quenched with water (50 ml)
4. additiondiluted with brine (50 ml)
5. extractionextracted with ethyl acetate (2×100 ml)
6. dry with materialThe organic layer was dried over sodium sulphate
7. filtrationfiltered
8. customevaporated
9. 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