Propargyl bromide → HCID 15767157, compound

Participants

Reaction Steps

A slurry of 8.3 g (39.1 mmol) of 2-phenyl-3,5,6,7-tetrahydro-4H-cyclopentapyrimidin-4-one in 60 mL of tetrahydrofuran was added to 1.9 g (48 mmol) of 60% sodium hydride, with external cooling. A 6.4 g (43.0 mmol) portion of 80% by weight of propargyl bromide in toluene was added to the cooled solution. The ice bath was removed and the reaction was refluxed for 6 hours. The solvent was removed in vacuo, ether was added to the residue and the reaction was washed 3 times with water and once with brine. The organic layer was dried over MgSO4 and concentrated to yield 5.0 g of crude semisolid product. The crude product was dissolved in a small amount of methylene chloride and passed through a 6 inch plug of silica gel, washing with 1 L of methylene chloride. The silica gel was washed further with 1 L of ether. The ether was removed in vacuo to yield 0.5 g (5.1%) of 2-phenyl-3-propargyl-3,5,6,7-tetrahydro-4H-cyclopentapyrimidin-4-one (Compound 1) as a white solid. 1H-NMR (CDCl3)δ2.15 (2H, m), 2.35 (1H, t), 2.95 (4H, t), 4.65 (2H,t), 7.55 (3H, m), 7.7 (2H,m).

Provenance & Evidence