Sodium hydride → HCID 86718393, compound

Participants

Reaction Steps

To a solution of 3-(4,6-bis(2,2,2-trifluoroethoxy)pyrimidin-2-yl)-1-(5-(trifluoromethyl)thiophen-2-yl)urea (1) (750 mg, 1.54 mmol) in anhydrous DMF (7.5 mL) at ambient temperature was added NaH (37 mg, 1.54 mmol, 60% dispersion in mineral oil). After stirring for 20 minutes a solution of benzyloxymethylchloride (241 mg, 1.54 mmol) in anhydrous DMF (0.75 mL) was added. After 2 h of stirring at room temperature the reaction was quenched with H2O (5 mL) and diluted with EtOAc. The organic layer was separated and washed with H2O (3×10 mL) and brine (10 mL). The organics were dried (Na2SO4), filtered and evaporated. The crude material was purified by silica gel chromatography (0 to 10% EtOAc in pet ether) to afford 3-(benzyloxymethyl)-3-(4,6-bis(2,2,2-trifluoroethoxy)pyrimidin-2-yl)-1-(5-(trifluoromethyl)thiophen-2-yl)urea as an off white solid (550 mg, 59%), mp 101-104° C.; 1H NMR (400 MHz, Acetone-d6) δ 11.82 (s, 1H), 7.37-6.99 (m, 5H), 6.65 (d, J=4.0 Hz, 1H), 6.17 (s, 1H), 5.71 (s, 2H), 4.97 (q, J=8.5 Hz, 4H), 4.60 (s, 2H); ESIMS m/z 605 ([M+H]+). Also isolated was a by-product 1,3-bis(benzyloxymethyl)-3-(4,6-bis(2,2,2-trifluoroethoxy)pyrimidin-2-yl)-1-(5-(trifluoromethyl)thiophen-2-yl)urea (11) as a pale yellow gum (65 mg); 1H NMR (400 MHz, Aceton) δ 7.29-7.05 (m, 10H), 6.87 (d, J=4.0 Hz, 1H), 5.90 (s, 1H), 5.40 (s, 2H), 5.23 (s, 2H), 4.75 (q, J=8.7 Hz, 4H), 4.69 (s, 2H), 4.52 (s, 2H); ESIMS m/z 618 ([M−PhCH2O]+).

Provenance & Evidence