Malonate Ion → 2-(2-Bromoallyl)propane-1,3-diol

Temperatur

-78 °C

Lithium aluminum hydride (1.9 g, 7.65 mmol) was slurried in anhydrous diethyl ether (50 ml) and cooled to −78° C. in a dry ice/acetone bath. A solution of the product from step A (0.639 g, 16.84 mmol) in dry ether (26 ml) was then added dropwise. After the malonate was added, the solution was allowed warm to room temperature and stirring was continued for 3 hours. The reaction was quenched with brine (50 ml), extracted with ethyl acetate (3×25 ml) and dried over MgSO4. The solvent was removed in vacuo to give the desired product (1.3 g, 86%) which was used for the next step without further purification. 1H-NMR (300 MHz, CDCl3) δ 5.66 (d, J=1.2 Hz, 1 H), 5.48 (d, J=1.5 Hz, 1H), 3.86 (m, 2 H), 3.73 (m, 2 H), 2.51 (d, J=7.5 Hz, 2 H), 2.40 (br s, 2 H), 2.15 (m, 1 H).

1. temperaturethe solution was allowed warm to room temperature
2. customThe reaction was quenched with brine (50 ml)
3. extractionextracted with ethyl acetate (3×25 ml)
4. dry with materialdried over MgSO4
5. customThe solvent was removed in vacuo

ORD-Eintrag

ord-193b3b6e5dce41f28971843ca14c3eb7

Quelldatensatz

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08101799B2