A facile, practical and environmentally attractive protocol for the direct diversification of N-heterocycles under ambient, metal- and base-free conditions was developed.

Without employing any base and organic solvent, an economical, practical and eco-friendly protocol has been developed for the ultrasound accelerated one-pot synthesis of various functionalized 2-sulfonylquinolines from easily accessible starting materials in water under open-air conditions.

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A convenient and sensitive method for determination of sulfanilamide (SNA) was described based on the Mn(II)-catalyzed oscillating chemical reaction. Under optimum conditions, a linear relationship existed between the changes of oscillating period or amplitude and the negative of logarithm of SNA concentration in the range of 4.27 × 10 −8 mol ·L −1 ∼ 7.41 × 10 −6 mol ·L −1 (RSD, 0.85%) and 9.33 × 10 −8 mol ·L −1 ∼ 3.02 × 10 −6 mol ·L −1 (RSD, 1.08%), respectively. The lower limit of detection was found to be 2.69 × 10 −8 mol ·L −1 and 6.03 × 10 −8 mol ·L −1 , respectively.