Diisopropylamine → Methyl 5-chloro-2-(4-fluorophenyl)-2-methoxyvalerate

Temperature

-30 °C

A solution of methyl (4-fluorophenyl)methoxyacetate (300 mg) in THF (1.5 mL) was added dropwise at −78° C. to a solution in THF (7 mL) of lithium diisopropylamide prepared from diisopropylamine (0.26 mL) and n-butyl lithium (2.66 M solution in hexane, 0.63 mL). Then, the reaction solution was gradually heated to −30° C. 1-chloro-3-iodopropane (0.25 ml) was added dropwise to the reaction solution at −30° C. Then, the reaction solution was gradually heated to 0° C. and stirred at the same temperature for one hour. A saturated ammonium chloride solution and ethyl acetate were sequentially added to the reaction solution, and the organic layer was separated. The resulting organic layer was sequentially washed with water, 1 N hydrochloric acid, water, a saturated sodium bicarbonate solution and brine. The resulting organic layer was dried over anhydrous magnesium sulfate and then concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 152 mg of the title compound. The property values of the compound are as follows.

1. temperatureThen, the reaction solution was gradually heated to 0° C.
2. customthe organic layer was separated
3. washThe resulting organic layer was sequentially washed with water, 1 N hydrochloric acid, water
4. dry with materialThe resulting organic layer was dried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe resulting residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system)

ORD record

ord-61775febf0b44dc3a16ff270429eda2c

Source dataset

uspto-grants-2011_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07973033B2