Tetrahydrofuran → (2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)(p-tolyl)methanone

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Reaction Steps

A 25-mL round bottom flask, with stirrer bar, was charged with 4-chloro-2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine (97 mg, 0.38 mol, 1.0 eq.) and THF (5.0 mL). A solution of 4-tolylmagnesium bromide (1.14 mL, 1.0M in THF, 1.14 mmol, 3.0 eq.) was added dropwise over 1 minute at room temperature. After stirring for 2 hrs at room temperature the reaction was heated to reflux for 2.5 hrs. The reaction was cooled to room temperature and was quenched with 2N HCl and diluted with ethyl acetate (50 mL). The organic layer was washed with sat. sodium chloride (3×5 mL), dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue (227 mg) was purified by chromatography on silica gel using hexanes/ethyl acetate (10:0 to 8:2) as the eluent, to afford (2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidin-4-yl)(p-tolyl)methanone (49 mg, 37% yield) as a yellow solid. MW=348.83. 1H NMR (DMSO-d6, 500 MHz) δ 8.31-8.26 (m, 2H), 7.29 (d, J=8.5 Hz, 2H), 7.62-7.53 (m, 2H), 7.41 (d, J=8.0 Hz, 2H), 3.12 (t, J=7.5 Hz, 2H), 3.06 (t, J=7.0 Hz, 2H), 2.43 (s, 3H), 2.06 (quintet, J=7.5 Hz, 2H).

Provenance & Evidence