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A 25-mL round bottom flask, with stirrer bar, was charged with 4-chloro-2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine (318 mg, 1.20 mol, 1.0 eq.) and Fe(acac)3 (6.6 mg, 19 mol, 0.05 eq.), NMP (0.4 mL) and THF (4.0 mL). The mixture was cooled to 0° C. under nitrogen. A solution of 4-methylbenzylmagnesium chloride (0.83 mL, 0.5M in THF, 0.41 mmol, 1.1 eq.) was added dropwise over 2 minutes. The resulting mixture was stirred 0° C. for 1.5 hr until the starting chloride was consumed. The reaction was quenched with a 9:1 sat. NH4Cl/conc. NH4OH solution (10 mL) then diluted with ethyl acetate (75 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 (175 mg) was purified by chromatography on silica gel using dichloromethane as the eluent, to afford 2-(3-chlorophenyl)-4-(4-methylbenzyl)-6,7-dihydro-5H-cyclopenta[d]pyrimidine (65 mg, 52% yield) as a white solid. MW=334.84. 1H NMR (DMSO-d6, 500 MHz) δ 8.35-8.30 (m, 2H), 7.58-7.51 (m, 2H), 7.20 (d, J=8.0 Hz, 2H), 7.11 (d, J=8.0 Hz, 2H), 4.07 (s, 2H), 2.97 (t, J=7.5 Hz, 2H), 2.88 (t, J=7.5 Hz, 2H), 2.25 (s, 3H), 2.06 (quintet, J=7.5 Hz, 2H).

1. customwas consumed
2. customThe reaction was quenched with a 9:1 sat. NH4Cl/conc
3. additionNH4OH solution (10 mL) then diluted with ethyl acetate (75 mL)
4. washThe organic layer was washed with sat. sodium chloride (3×5 mL)
5. dry with materialdried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue (175 mg) was purified by chromatography on silica gel