Sodium hydride → 5-[4-[[5-(2,5-Dimethylphenoxy)-2,2-dimethyl-1-oxopentyl]amino]phenoxy]-2,2-dimethylpentanoic acid, methyl ester

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Reaction Steps

Sodium hydride, 50% dispersion in mineral oil, 2.2 g, is added to 15.3 g of 5-(2,5-dimethylphenoxy)-N-(4-hydroxyphenyl)-2,2-dimethylpentanamide in 200 ml of N,N-dimethylformamide (DMF). Then 10 g of methyl 5-bromo-2,2-dimethylpentanoate (Journal of Medicinal Chemistry, Vol. 26, pp 1020-1027 (1983)) is added to the previous mixture. The mixture is stirred overnight and then stirred three hours on a steam bath, the DMF is removed on a rotary evaporator and water is added to the residue. The product is taken up in diethyl ether, extracted with base, washed with water and concentrated on a steam bath. Isopropyl ether is added to afford 10.4 g of 5-[4-[[5-(2,5-dimethylphenoxy)-2,2-dimethyl-1-oxopentyl]amino]-phenoxy]-2,2-dimethylpentanoic acid, methyl ester after recrystallization from isopropyl ether (2X); mp 62°-63° C.

Provenance & Evidence