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Synthesis of 7-deazadenine derivatives 6a–6e. Reagents and conditions: i) Cl(CH2)2OCH2P(O)(OiPr)2, Cs2CO3, DMSO, 80 °C; ii) EtOH/NH3, 100 °C; iii) TMSBr, pyridine, rt; then (L)-NH2CH(Bn)COOiPr·HCl, PPh3, Aldrithiol-2, pyridine, Et3N, 70 °C.
