3-butyl-1-methyl-2,6-dioxo-7-(2-propen-1-yl)-2,3,6,7-tetrahydro-1H-purine-8-carbonitrile → 3-butyl-1-methyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purine-8-carbonitrile

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Reaction Steps

A solution of 3-butyl-1-methyl-2,6-dioxo-7-(2-propen-1-yl)-2,3,6,7-tetrahydro-1H-purine-8-carbonitrile (230 mg, 0.80 mmol) in anhydrous THF (5 ml) and anhydrous DMSO (0.5 ml) was treated with Pd(PPh3)4 (185 mg, 0.16 mmol). The mixture was degassed under gentle vacuum, morpholine (698 uL) added, and left to stir at rt under nitrogen for 2 hours. The yellow solution was partitioned between 2M HCl (aq) and EtOAc. The organic layer was separated, washed with brine, dried (MgSO4) and concentrated. The residue was taken up in MeOH and passed down and amino-propyl SPE (5 g), eluting with MeOH followed by 5% AcOH then 10%, 20% and 30% AcOH/MeOH mixtures. The product fractions were combined and concentrated to afford a pale yellow solid (116 mg). This was washed with MeOH and the title compound a white solid was collected by filtration and dried under vacuum (55 mg, 28%). NMR; δH (400 MHz, d6-DMSO) 0.90 (t, 3H, J=7.5 Hz), 1.25-1.35 (m, 2H), 1.59-1.68 (m, 2H), 3.24 (s, 3H), 3.96 (t, 2H, J=7 Hz), NH not observed to δH 15; m/z 248.2[MH+].

Provenance & Evidence