Scheme 8.
Reagents and conditions: (i) K2CO3, catalytic KI and 18-crown-6, dry acetonitrile, microwave 150 Watt, 6.5 bar, 175 °C, 45 min; (ii) NaBH4, MeOH, 0 °C, 1 h (R = -H, -CH3, -OH, benzyl).
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