Valinol → 5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-N-[1-(hydroxymethyl)-2-methylpropyl]-1,2-benzisothiazole-3-carboxamide

Participants

Reaction Steps

To a solution of 2-amino-3-methyl-1-butanol (1.39 g, 13.5 mmol) in anhydrous tetrahydrofuran at 0° C. is added dropwise a solution of 5-[3,6-Dihydro-3-methyl-2,6-dioxo-4-(trifluoromethyl)-1(2H)-pyrimidinyl]-1,2-benzisothiazole-3-carboxylic acid chloride (2.10 g, 5.39 mmol) in tetrahydrofuran. The resultant mixture is stirred 7.5 hours at ambient temperature, diluted with diethyl ether, washed with 1M aqueous hydrochloric acid, saturated sodium bicarbonate and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo. The residue is chromatographed on silica gel with hexanes-ethyl acetate to afford the title compound as a solid (2.12 g, 86.2%, mp 120° C.) which is identified by NMR spectral analysis.

Provenance & Evidence