Methyl iodide → Methyl 2-methyl-2-phenylpropanoate

Temperature

-30 °C

A solution of n-butyl lithium in hexane (1.44N, 60.0 ml, 86.4 mmol) was added to a solution of diisopropylamine (9.07 g, 89.6 mmol) in anhydrous THF (200 ml) cooled at -30° C. under argon atmosphere, and the mixture was stirred for 20 minutes. To this reaction mixture were added a solution of methyl 2-phenylpropionate (10.5 g, 64.0 mmol) in 10 ml of anhydrous THF and HMPA (16.5 g, 92.0 mmol), and the mixture was stirred at -30° C. for 10 minutes and then at 0° C. for 45 minutes. To this reaction solution was added a solution of methyl iodide (13.6 g, 96.0 mmol) in anhydrous THF (30 ml) at -30° C., and the mixture was stirred at -30° C. for 1 hour. This reaction mixture was added to an aqueous saturated solution of ammonium chloride (400 ml) and water (50 ml) was added. The mixture was extracted with ether (400 ml). The aqueous layer further extracted with ethyl acetate. The combined organic layers were washed with water (300 ml) and brine, dried over anhydrous magnesium sulfate, and concentrated. The residue was distilled (b.p. 99°-100° C./6 mmHg) to give an oil of methyl 2-methyl-2-phenylpropionate (7.63 g, 42.9 mmol, 67.0%). This compound was assigned the structure by the following data:

1. stirringthe mixture was stirred at -30° C. for 10 minutes
2. waitat 0° C. for 45 minutes
3. stirringthe mixture was stirred at -30° C. for 1 hour
4. additionwas added
5. extractionThe mixture was extracted with ether (400 ml)
6. extractionThe aqueous layer further extracted with ethyl acetate
7. washThe combined organic layers were washed with water (300 ml) and brine
8. dry with materialdried over anhydrous magnesium sulfate
9. concentrationconcentrated
10. distillationThe residue was distilled (b.p. 99°-100° C./6 mmHg)

ORD record

ord-db6f728ea29e4fb5a245b208255e6f89

Source dataset

uspto-grants-1988_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04775692