Lithium diisopropylamide → 2-(4-Fluorophenyl)-3-(2-methylsulfanyl-pyrimidin-4-yl)-3-hydroxypropionic acid methyl ester

To a cold (−78° C.) solution of lithium diisopropylamide (21.4 mL of 2M solution in THF, 42.8 mmol) in THF (70 mL) is added dropwise a solution of methyl 4-fluorophenyl-acetate (6.0 g, 35.7 mmol) in THF (30 mL). The solution is stirred for 1 hour at −78° C. after which a solution of 2-methylsulfanyl-pyrimidine-4-carbaldehyde, 1, (6.0 g, 39.3 mmol) in THF (30 mL) is added dropwise to the reaction mixture. Stirring is continued for 45 minutes at −78° C. then the reaction is quenched by pouring the reaction solution into aqueous saturated NH4Cl. The aqueous phase is extracted with ethyl acetate. The organic phases combined, dried (MgSO4), filtered, and concentrated in vacuo. The crude residue is purified over silica (33% EtOAc/hexanes) to afford 8.7 g (76%) of the desired product as a mixture (1:1) of diastereomers.

1. additionis added dropwise to the reaction mixture
2. customthe reaction is quenched
3. additionby pouring the reaction solution into aqueous saturated NH4Cl
4. extractionThe aqueous phase is extracted with ethyl acetate
5. dry with materialdried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe crude residue is purified over silica (33% EtOAc/hexanes)

ORD-Eintrag

ord-b695f5fa5646402185bd99e6f5509a2f

Quelldatensatz

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07087615B2