Chlorotrimethylsilane → HCID 85195736, compound

Temperature

0 °C

To a solution of ethyl 4-chloro-3-oxobutanoate (30 g, 0.183 mol, 24.7 mL) and trimethylsilyl chloride (30.2 mL, 0.234 mol) in tetrahydrofuran (360 mL) was added dropwise triethylamine (30.61 mL, 0.23 mol) at -20° C. with mechanical stirring. After the addition was complete (~15 minutes), the mixture was stirred for an additional 30 minutes at -20° C., 30 minutes at 0° C., and then one hour at room temperature. The reaction was diluted with a large excess of hexane (1 L). The resulting precipitate was filtered and the solution was concentrated on a rotavap to an oily residue. It was diluted with hexane (400 mL), filtered and the filtrate was concentrated on a rotavap to an oily residue. This process was repeated until no further precipitation occurred. Distillation of the residue (b.p. 70° C. to 78° C./1 mm Hg) gave the title compound (33 g, 80%) as a mixture of cis,trans isomers.

1. additionAfter the addition
2. custom(~15 minutes)
3. customone hour
4. customat room temperature
5. filtrationThe resulting precipitate was filtered
6. concentrationthe solution was concentrated on a rotavap to an oily residue
7. additionIt was diluted with hexane (400 mL)
8. filtrationfiltered
9. concentrationthe filtrate was concentrated on a rotavap to an oily residue
10. customThis process was repeated until no further precipitation
11. distillationDistillation of the residue (b.p. 70° C. to 78° C./1 mm Hg)

ORD record

ord-411a5627fca0479fa231cc7047f73196

Source dataset

uspto-grants-1994_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05298625