Triphenylphosphine → 3-Benzoyl-1-(5-trityloxypentyl)-1H-pyrimidine-2,4-dione

Beteiligte Stoffe

Reaktionsschritte

Polymer supported triphenyl phosphine (2.5 eq, 3 mmol/g loading) was swelled in dry THF for 15 minutes then the alcohol 14 (1 eq, 300 mg) and the N3-benzoyluracil (1.5 eq) were added into the suspension, which was shaken at room temperature under atmosphere of nitrogen. A solution of DIAD (2 eq) in THF was added slowly into the suspension. The reaction was shaken overnight until the disappearance of the alcohol was observed by TLC. The resin was then filtered off and washed with THF (5 ml). The solvent was removed under reduced pressure to afford a residue which was taken in a mixture of Hexane/EtOAc (50:50). The formed white precipitate was removed and the solution was concentrated to an orange oil and purified by flash chromatography using a mixture of Hexane/EtOAc (40:60) as eluent which gave the title compound (250 mg, 53%).

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