Morpholine → 5-(8-chloro-2,6-dioxo-3-pentyl-2,3,6,7-tetrahydro-1H-purin-1-yl)pentanenitrile

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A solution of 8-chloro-3-pentyl-7-(2-propen-1-yl)-3,7-dihydro-1H-purine-2,6-dione (4.0 g, 13.5 mmol) in DMF (100 ml) was treated with caesium carbonate (4.83 g, 14.8 mmol) and 5-bromopentanenitrile (1.73 ml, 14.8 mmol). The mixture was heated at 50° C. in a nitrogen atmosphere for 19 h and then cooled. The mixture was then degassed by the repeated successive application of a vacuum and then nitrogen pressure. The mixture was then treated with tetrakis(triphenylphosphine)palladium(0) (1.1 g, 0.94 mmol) and morpholine (11.8 ml, 136 mmol). The mixture was stirred in a nitrogen atmosphere for 3 h and then partitioned between EtOAc and 2M aqueous hydrochloric acid. The organic layer was separated, washed with brine, dried (MgSO4) and concentrated to reveal a yellow, oily residue. This was dissolved in MeOH, divided equally into four portions and each portion applied to a 20 g aminopropyl SPE which was then washed through with MeOH. The desired product was eluted from the cartridge with a 5% v/v solution of AcOH in MeOH. The product-containing fractions were combined and concentrated to yield the title compound as a pale yellow solid (4.03 g, 88%).

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