Formaldehyde → N-(6-dimethylamino-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl)-methanesulfonamide

Participants

Reaction Steps

A mixture of 370 mg (1.094 mmol) of N-(6-amino-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl)-methanesulfonamide, 0.083 ml (1.02 mmol) of formaldehyde solution (37% in water), 0.0033 ml of acetic acid, 21 ml of tetrahydrofuran and 21 ml of water is hydrogenated in presence of 100 mg of palladium on carbon for 10 days. After day 1, 3, 4, 5 and 6 another portion of formaldehyde (0.083 ml) and acetic acid (0.0033 ml) is added. After filtration of the reaction mixture the tetrahydrofuran is evaporated and the remaining aqueous phase extracted with ethyl acetate. The organic phase is washed with brine, dried over Na2SO4 and concentrated to dryness leaving a yellow powder that is fractionated by medium pressure chromatography on a RP-18 column (20 μm particle size) with acetonitril/water 3:4. The fractions containing the product are combined and extracted with ethyl acetate, the organic phase dried over Na2SO4 and concentrated yielding 277 mg of N-(6-dimethylamino-2,4-dioxo-7-trifluoromethyl-1,4-dihydro-2H-quinazolin-3-yl)-methanesulfonamide as yellow powder, m.p. 254-272° C.

Provenance & Evidence