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Reaction conditions: (a) Vilsmeier reagent, aq NH3, 0 °C, 16 h, 30%; (b) R2aR2bN where R2a = H and R2b = Me or where R2a = R2b = Me, DMAP, EDCI, 0 °C to rt, 24 h, 14–51%; (c) R2I where R2 = Et or R2 = i-Pr, K2CO3, rt, 4 h, 24–87%; (d) (CH3)2NCH(Ot-Bu)2, reflux, 11/2 h, 81%.
