[Cl:1][C:2]1[CH:3]=[C:4]([CH:7]=[CH:8][C:9]=1[S:10]([CH3:13])(=[O:12])=[O:11])[CH:5]=O.N1CCCCC1.C(O)=O.[CH3:23][C:24](=[O:29])[CH2:25][C:26](=[O:28])[CH3:27]>CN(C=O)C.O>[Cl:1][C:2]1[CH:3]=[C:4]([CH:5]=[C:25]([C:24](=[O:29])[CH3:23])[C:26](=[O:28])[CH3:27])[CH:7]=[CH:8][C:9]=1[S:10]([CH3:13])(=[O:12])=[O:11]
To a solution containing 1.42 g 3-chloro-4-methylsulfonylbenzaldehyde, 0.05 ml piperidine and 0.02 ml formic acid in 20 ml DMF was added 1.50 ml 2,4-pentanedione with stirring at 20° C. The solution was stirred overnight at 20° C. and poured into water. The oily residue was separated and crystallized from ethanol, yield 0.24 g (10%), mp. 140-142° C. 1H-NMR (DMSO-d6, 400 MHz): 2.28 (s, 3 H, CH3), 2.50 (s, 3 H, CH3), 3.40 (s, 3 H, CH3), 7.60 (m, 1 H, Ar), 7.80 (m, 1 H, Ar), 7.77 (s, 1 H, CH), 8.1 (m, 1 H, Ar).
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