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Synthesis of analogs 29 and 61. Reaction Conditions: (a) CDI (2 eq), CH2Cl2, rt, overnight; (b) isopropylphenol (2 eq), Et3N (5 eq), Cs2CO3 (2 eq), acetonitrile, 70 °C, 3–4 h; (c) TFA-CH2Cl2 (1:1), rt, 2 h; (d) 6-chloronicotinonitrile or 6-chloropyridazine-3-carbonitrile (1.1 eq), Et3N (2 eq), acetonitrile, 160 °C, 30 min.
