Sodium hydride → 2-Fluoro-4-(6-hydroxymethyl-4-methyl-2-propyl-benzoimidazol-1-ylmethyl)-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

(7-Methyl-2-propyl-3H-benzoimidazol-5-yl)methanol (3 g, 15 mmol; prepared as described in Preparation 7) was dissolved in 20 mL of dry DMF. The solution was cooled to 0° C. and sodium hydride (598 mg, 15 mmol, 60 wt % in mineral oil) was added. The mixture was stirred for 30 minutes. 4-Bromomethyl-2-fluorobenzoic acid methyl ester (3.7 g, 15 mmol; prepared as described in Preparation 3) in 50 mL of DMF was added, and the mixture was warmed to room temperature and stirred for 10 minutes. The solution was partitioned between EtOAc (300 mL) and 150 mL 10% LiCl (aqueous). The organic layer was separated, dried over MgSO4 and concentrated. The concentrate was flash chromatographed to produce Intermediate (8a) as a clear oil (2.4 g). MS m/z: [M+H+] calcd for C21H23FN2O3, 371.7. found 371.0.

Provenance & Evidence