5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1, 2-benzisothiazole-3-carboxaldehyde → HCID 22119976, compound

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Reaction Steps

Methyl magnesium chloride (14.1 ml, 0.0422 mol) is added dropwise to a solution of 5-[3,6-dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-carboxaldehyde (6.00 g, 0.00170 mol) in tetrahydrofuran at -78° C. over 15 minutes. The resultant mixture is stirred at -78° C. for 30 minutes, quenched with saturated ammonium chloride and allowed to warm to room temperature. After dilution with ethyl acetate, the mixture is washed with saturated ammonium chloride, water and brine, dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo to a solid. The solid is chromatographed on silica gel with hexanes/ethyl acetate to give the title compound as a white crystalline solid (4.49 g, 71.1%) which is identified by NMR spectral analysis.

Provenance & Evidence