Dimethylformamide dimethyl acetal → HCID 20548490, compound

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Reaction Steps

To a 6 g. portion of crude 1-(3-trifluoromethylphenyl)-2,4-octanedione was added 40 ml. of N,N-dimethylformamide dimethyl acetal and a few milliliters of methanol. The mixture was stirred under reflux overnight, and was then evaporated under vacuum to obtain 8.9 g. of a thick dark oil. The oil was taken up in 50 ml. of methanol, 9 g. of methylamine hydrochloride was added, and the mixture was stirred under reflux for 3 hours. It was then evaporated to a semi-solid under vacuum, and the residue was partitioned between diethyl ether and water. The organic layer was dried over magnesium sulfate and evaporated under vacuum. The residue was chromatographed on a 300 g. silica gel column with 2:3 ethyl acetate:dichloromethane, and the product-containing fractions were combined and evaporated under vacuum to obtain 0.17 g. of the desired product in impure form. Nmr analysis in DMSOd6 showed peaks at δ7.6-8.3 (m, 6H, aromatic); 3.8 (s, 3H, N--CH3); 3.0-3.3 (t, 2H, COCH2); 0.7-1.8 (m, 7H, CH2CH2CH3).

Provenance & Evidence