Chlorotrimethylsilane → Ethyl 3-cyclohexyl-3-methylbutanoate

Trimethylsilyl chloride (1.3 ml, 10.2 mmol), copper (I) chloride (30 mg, 0.3 mmol) and cyclohexylmagnesium chloride (4.6 ml, 2N in diethyl ether, 9.2 mmol) were added slowly to an ice-cooled solution of ethyl 3,3-dimethylacrylate (1 g, 8.5 mmol) in tetrahydrofuran (10 ml). The solution was stirred for 10 minutes, then allowed to warm to room temperature and stirred for an hour. Saturated aqueous ammonium chloride solution (10 ml) was added and the mixture was partitioned between water (10 ml) and diethyl ether (20 ml). The layers were separated and the aqueous phase was extracted with diethyl ether (2×10 ml). The combined organic extracts were dried (MgSO4) and concentrated under reduced pressure. The crude product was purified by column chromatography on silica gel using ethyl acetate:pentane(5:95) as eluant to afford the title compound, 1.2 g. 1H-NMR (CDCl3, 400 MHz) δ: 0.75 (m, 8H), 1.05-1.28 (m, 7H), 1.62 (m, 1H), 1.78 (m, 4H), 2.20 (s, 2H), 4.10 (q, 2H).

1. stirringstirred for an hour
2. customthe mixture was partitioned between water (10 ml) and diethyl ether (20 ml)
3. customThe layers were separated
4. extractionthe aqueous phase was extracted with diethyl ether (2×10 ml)
5. dry with materialThe combined organic extracts were dried (MgSO4)
6. concentrationconcentrated under reduced pressure
7. customThe crude product was purified by column chromatography on silica gel

ORD-Eintrag

ord-34c3090648704563a602edad49707405

Quelldatensatz

uspto-grants-2004_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06713496B2