Hydrochloric Acid → {9-Chloro-1-[6-methoxy-2-(trifluoromethyl)pyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazol-6-yl}methanol

Participants

Reaction Conditions

Reaction Steps

To a solution of calcium chloride (670 mg, 6.04 mmol) in ethanol (15 mL) was added sodium tetrahydroborate (457 mg, 12.08 mmol) at 0° C. The mixture was stirred at 0° C. for 1 hr. A solution of methyl 9-chloro-1-[6-methoxy-2-(trifluoromethyl)pyridin-3-yl]-1,2,3,4-tetrahydropyrimido[1,2-a]benzimidazole-6-carboxylate (1.33 g, 3.02 mmol) in tetrahydrofuran (15 mL) was added dropwise to the mixture at 0° C. The mixture was stirred at 0° C. for 12 hr. 1N HCl (ca. 9.0 mL) was added to the reaction mixture at 0° C., and the aqueous ammonium chloride was added to the mixture. The solvent was removed in vacuo. The precipitated solid was collected by filtration, washed with water and diisopropyl ether to give the title compound (1.33 g, 3.02 mmol, quant) as a white solid.

Provenance & Evidence