Dimethylformamide → HCID 86613170, compound

Temperature

0 °C

Add n-butyl lithium 1.6N (23 ml, 36.8 mmol) to diisopropylamine (5.0 ml, 35.6 mmol) in anhydrous THF (7 ml) at 0° C. Stir the resulting yellow solution for 30 min at 0° C. Add this LDA solution dropwise via canula to a solution of 2,2-Dimethyl-propionic acid 4-bromo-2,6-difluoro-phenyl ester (8.01 g, 27.33 mmol) in anhydrous THF (40 ml) at −78° C. over 40 min. Stir the resulting bright yellow solution for 1 h at −78° C. Add anhydrous DMF (2.8 ml, 35.0 mmol) and stir the mixture for 1.5 h at −78° C. Quench the mixture with dilute sulfuric acid and extract the product with EtOAc (×3). Wash the combined organic layers with water (×3), saturated aq. sodium chloride and dry over anhydrous sodium sulfate. Filter and concentrate to yield the crude product. Purification by flash chromatography (Silica gel-hexane/EtOAc) yields 8.35 g of the title compound (95% yield).

1. stirringStir the resulting bright yellow solution for 1 h at −78° C
2. customQuench the mixture with dilute sulfuric acid
3. extractionextract the product with EtOAc (×3)
4. washWash the combined organic layers with water (×3), saturated aq. sodium chloride
5. dry with materialdry over anhydrous sodium sulfate
6. filtrationFilter
7. concentrationconcentrate
8. customto yield the crude product
9. customPurification by flash chromatography (Silica gel-hexane/EtOAc)

ORD record

ord-8782fb1b786b4203a67111193e2db61f

Source dataset

uspto-grants-2008_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07393868B2