CC(C)([O-])C.[K+].O1CCCC1.[Cl:12][C:13]1[CH:20]=[CH:19][C:16]([CH2:17][OH:18])=[CH:15][CH:14]=1.Cl[C:22]1[N:26]([CH3:27])[N:25]=[CH:24][C:23]=1[CH:28]=[O:29]>O>[Cl:12][C:13]1[CH:20]=[CH:19][C:16]([CH2:17][O:18][C:22]2[N:26]([CH3:27])[N:25]=[CH:24][C:23]=2[CH:28]=[O:29])=[CH:15][CH:14]=1Under cooling in an ice bath, potassium tert-butoxide (217 mg) was added to a tetrahydrofuran (2.8 mL) solution of 4-chlorobenzyl alcohol (217 mg), and the obtained solution was then stirred for 20 minutes. Under cooling in an ice bath, 5-chloro-1-methyl-1H-pyrazol-4-carbaldehyde (200 mg) was added to the reaction solution, and the obtained solution was then stirred for 3 hours. Thereafter, water was added to the reaction solution, and the obtained mixture was then extracted with ethyl acetate. The organic layer was washed with a saturated saline, and was then dried over anhydrous magnesium sulfate, followed by vacuum concentration. The residue was purified by column chromatography (silica gel cartridge, hexane:ethyl acetate=80:20 to 60:40), so as to obtain the title compound (127 mg) in the form of a colorless oily substance.
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