Hydrochloric Acid → 4-(2,6-dioxo-1,3-dipropyl-2,3,6,7-tetrahydro-1H-purin-8-yl)-bicyclo[2.2.2]octane-1-carbaldehyde

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Reaction Steps

8-(4-Hydroxymethyl-bicyclo[2.2.2]oct-1-yl)-1,3-dipropyl-3,7-dihydropurine-2,6-dione (X, Example 8, 0.440 kg) and dimethyl sulphoxide (1.76 l) are mixed under nitrogen, stirred for 5 to 15 mins and triethylamine (1.065 l) is added. A mixture of sulphur trioxide pyridine complex (0.561 kg) in dimethyl sulphoxide (2.64 l) is added, maintaining the internal temperature below 30° C. The internal temperature is adjusted to 14 to 20° C. and the reaction mixture is stirred at 14 to 20° C. for 20 hours. Ethyl acetate (8.80 l) and hydrochloric acid (1 M, 4.40 l) are added to the reaction and the mixture is stirred vigorously for 15 mins. The layers are separated and the organic layer is washed twice more with hydrochloric acid (1 M, 4.40 l). The organic layer is then washed with saline (2.20 l), dried over magnesium sulfate (0.223 kg) for 10 mins, filtered and the filter cake is washed with ethyl acetate (0.440 l). The solvent is evaporated under reduced pressure at 40 to 45° to give the title compound.

Provenance & Evidence