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Reagents and conditions: (a) i—HMDS, (NH4)2SO4, reflux, 20 h, ii—2-amino-6-chloropurine, TMSOTf; (b) isoamyl nitrite, I2, CuI, CH2I2 in THF, reflux; (c) CH3NH3Cl, Et3N, EtOH, reflux; (d) Ph3P, H2O, THF, 2 days; (e) phenylacetylene, (PPh3)2PdCl2, CuI, Et3N, DMF.
