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A combinatorial library of polyhydroquinoline scaffolds is successfully attempted by multicomponent cyclocondensation reaction.

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A novel strategy for N‐chlorosuccinimide mediated direct sulfenylation of 1‐aryl pyrazolones using aryl thiols has been developed at room temperature. The protocol was found to be simple, efficient and transition metal‐free to afford the target products in good to excellent yields without further purification. The prepared compounds were characterised by 1H NMR, 13C NMR and IR spectroscopy. The skeleton of one of the synthesized compounds has been well confirmed by X‐ray single crystal diffraction (XRD) analysis as well as ORTEP diagram.

The synthesis of a novel tolylthiopyrazol bearing methyl group has been achieved by transition metal free N-chlorosuccinimide mediated direct sulfenylation of 1-aryl pyrazolones at room temperature. The product obtained was characterized by spectroscopic techniques and finally confirmed by X-ray diffraction studies. The compound 1-(2-chlorophenyl)-3-methyl-4-(p-tolylthio)-1H-pyrazol-5-ol (m.f. C17H15N2OSCl) crystallizes in monoclinic crystal class in space group P21/c with cell parameters a = 9.6479(5) Å, b = 15.1233(8) Å, c = 11.4852(6) Å, β = 108.374(2)°, V=1590.4(2) Å3 and Z = 4. The final residual factor R1 = 0.0499.