Morpholine → (+/-)-cis-4-(2-Amino-6-morpholino-9H-purin-9-yl)-2-cyclopentene-1-methanol

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A solution of (±)-cis-4-(-2-Amino-6-chloro-9H-purin-9-yl)-2-cyclopentene-1-methanol (0.531 g, 2.00 mmol) from Example 4 and morpholine (0.526 g, 6.04 mmol) in ethanol (6 mL) was stirred at reflux for 1 hour. The reaction mixture was allowed to cool to room temperature before the addition of 2 mL of 1.0 N NaOH. Concentration of the mixture afforded the crude product which was purified by elution from a silica gel column using 5% methanol in chloroform (0.62 g, 98%). Crystallization of such a sample from ethanol-water gave a white powder; m.p. 165-167° C.

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