Morpholine → 8-Chloro-1-(5-{5-[(3,4-dichlorophenyl)methyl]-2H-tetrazol-2-yl}pentyl)-3-pentyl-3,7-dihydro-1H-purine-2,6-dione

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To a solution of 8-chloro-3-pentyl-7-(2-propen-1-yl)-3,7-dihydro-1H-purine-2,6-dione (0.18 g, 0.61 mmol) in THF (5 ml) was added 5-{5-[(3,4-dichlorophenyl)methyl]-2H-tetrazol-2-yl}-1-pentanol (0.191 g, 0.61 mmol; prepared in similar fashion to Example 35), triphenylphosphine (0.36 g, 1.3 mmol) and finally dibenzylazodicarboxylate (0.40 g, 1.3 mmol). The solution was stirred for 18 h after which Pd(PPh3)4 (0.16 g, 0.137 mmol) followed by morpholine (0.75 ml, 8.3 mmol) was added and the solution stirred at ambient temperature for 6 h. The solution was loaded onto an aminopropyl SPE (5 g) and eluted with MeOH then 5% AcOH/MeOH to yield the title compound containing minor impurities. Further chromatography (silica SPE, 20 g) eluting with ether yielded the title compound as a white solid (0.061 g, 18%).

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