Table 2. Substrate Scope for the Ultrasonic-Assisted Synthesis of 2-Phenylimidazo[1,2-a]pyridin-3-yl)cyclohex-2-enones Derivatives 4(a-o)^a.

^aReaction conditions: 2-aminopyridine derivatives (1 mmol) 1(a-b), pertinent acetophenone (1 mmol) 2(a-g), dimedone (1 mmol) (3), and a catalytic amount (20 mol %) of I₂ was irradiated for 1 h in the presence of water. Reactants 2(a-g) and (3) were added to the reaction mixture only after the disappearance of the reactant 1(a-b).

^bIsolated yield.