Bromocyclopentane → Tert-butyl 2-cyclopentyl-2-(4-methylphenyl)acetate

Participants

Reaction Conditions

Reaction Steps

33.5 g (0.3 mol) of potassium tert-butylate are initially introduced into 100 ml of anhydrous DMF at 0° C., and 51.6 g (0.25 mol) of the compound from Example V in 250 ml of anhydrous DMF are added dropwise. The mixture is stirred at 0° C. for 30 minutes, 32.2 ml (0.3 mol) of cyclopentyl bromide in 150 ml of anhydrous DMF are added dropwise at 5°-15° C. and the mixture is stirred at 25° C. for 20 hours. After concentration, the residue is partitioned between water and diethyl ether and the ether phase is dried over sodium sulphate and concentrated. The product crystallizes out. Yield: 67 g (97.5% of theory) Melting point=51°-53° C.

Provenance & Evidence