反应详情

To a solution of tert-butyl-[[3-(methoxymethoxy)phenyl]methoxy]-dimethyl-silane (WO2012/076877 Intermediate 103, 500 mg, 1.77 mmol) in dry Hexane (5 mL), at room temperature, butyllithium 1.6M solution in Hexane (1.33 ml, 2.12 mmol) was slowly added and the reaction mixture was stirred for 2 hours at the same temperature. 2,2-dimethylpropanal (152.5 mg, 1.77 mmol) was added and the reaction mixture was stirred for further 30 minutes at the same temperature. The reaction was quenched with water (5 ml), diluted with an aqueous saturated solution of ammonium chloride (20 ml), and extracted with ethyl acetate (2×50 ml). The organic layer was dried (Na2SO4), filtered and evaporated. The residue was dissolved in THF (10 mL) and a 1M solution in THF of tetrabutylammonium fluoride (1.77 ml, 1.77 mmol) was added. The reaction mixture was stirred for 30 minutes at room temperature. The reaction was diluted with an aqueous saturated solution of ammonium chloride (20 ml), and extracted with ethyl acetate (2×50 ml). The organic layer was dried (Na2SO4), filtered and evaporated and the residue was purified by flash chromatography (Biotage system) on silica gel using a SNAP 25 g as column and cyclohexane/ethyl acetate from 100:0 to 70:30 as eluent affording the title compound (300 mg) as colorless oil.

1. stirringthe reaction mixture was stirred for further 30 minutes at the same temperature
2. customThe reaction was quenched with water (5 ml)
3. additiondiluted with an aqueous saturated solution of ammonium chloride (20 ml)
4. extractionextracted with ethyl acetate (2×50 ml)
5. dry with materialThe organic layer was dried (Na2SO4)
6. filtrationfiltered
7. customevaporated
8. dissolutionThe residue was dissolved in THF (10 mL)
9. stirringThe reaction mixture was stirred for 30 minutes at room temperature
10. extractionextracted with ethyl acetate (2×50 ml)
11. dry with materialThe organic layer was dried (Na2SO4)
12. filtrationfiltered
13. customevaporated
14. customthe residue was purified by flash chromatography (Biotage system) on silica gel using a SNAP 25 g as column and cyclohexane/ethyl acetate from 100:0 to 70:30 as eluent