Methyl iodide → 3-(4-Chlorophenyl)-2-methylpropanoic acid

Temperature

-30 °C

A solution of 3-(4-chlorophenyl)propionic acid (1.85 g, 10 mmol) in 10 mL of THF was added to 16 mL of freshly prepared 1.5 M LDA (24 mmol) at dry ice-acetone bath temp. The reaction mixture was stirred 1 hr as it warmed to −30° C. and 1.6 mL (25 mmol) of methyl iodide was added. The resulting mixture was stirred at the same temp. for 0.5 h and the stirring was continued at RT overnight. The reaction was quenched with 1 N HCl, and diluted with ether. The solution was washed with water, 10% sodium thiosulfate and brine. The organic layer was dried over MgSO4. Solvent removal gave a mixture of the desired methylated product and the starting acid. Repetition of the above procedure on this residue gave the desired 2-methyl-3-(4-chlorophenyl) propionic acid contaminated with ˜5% of the starting acid as an oil. NMR: 1.5 (d, 3H), 4.78 (q, 1H). 6.84 & 7.26 (2d, 4H).

1. stirringThe resulting mixture was stirred at the same temp
2. waitfor 0.5 h
3. waitthe stirring was continued at RT overnight
4. customThe reaction was quenched with 1 N HCl
5. additiondiluted with ether
6. washThe solution was washed with water, 10% sodium thiosulfate and brine
7. dry with materialThe organic layer was dried over MgSO4
8. customSolvent removal
9. customgave
10. additiona mixture of the

ORD record

ord-ddab4f9c06fd4dc48cab4919a9e0a60b

Source dataset

uspto-grants-2009_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07576239B2