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The chemical structures and synthesis of 24, 25, 26, and 27. Reagents and conditions: (a) (1) EDCI, HOBT; (2) DIEA, DMF; (b) TMSBr; (c) EDCI, HOBT; (d) DIEA, DMF; (e) (BnO)2P(O)H, CCl4, DIEA, DMAP; (f) Pd/C, H2; (g) ion exchange; (h) 28, DEPC, TEA; (i) TEA; (j) 32, DEPC, TEA; (k) pyridine; (l) 6-AQ, DEPC, TEA; (m) (1) 28, TEA, HBTU, DMF; (2)TFA, CHCl2; (n) 31, CH2Cl2, DEPC, TEA, 0 °C-r.t.
