Scheme 4. Reagents and conditions.
a) 17, K-salt of 2-fluoroadenine, CH3CN/CH2Cl2, CaH2, rt, 23, 28%; 24, 28%; b) 23, LiOH·H2O, CH3CN/H2O, rt, 25, 73%; 24, LiOH·H2O, CH3CN/H2O, rt, 26, 87%.
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