Aluminium lithium hydride → 2-[2-(4-Chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-2-cyclopentyl-ethanol

Participants

Reaction Steps

To an ice-cold solution of 2.0 g (5.12 mmol) [2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-cyclopentyl-acetic acid in 55 ml tetrahydrofuran were added in portions 0.29 g (7.64 mmol) lithium aluminium hydride. After removal of the cooling bath the reaction mixture was stirred for 2.5 h at room temperature and then poured onto 200 ml saturated aqueous tartrate solution. The phases were separated and the aqueous layer extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and evaporated. The residue was purified by silica gel chromatography using a MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of heptane:ethyl acetate (100:0 to 50:50). Yellow solid (68%). MS (Turbo Spray): m/z=377.2 [M+H].

Provenance & Evidence