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

Participants

Reaction Steps

To an ice-cold solution of 1.18 g (2.68 mmol) [2-(4-chloro-phenyl)-5,6-difluoro-benzoimidazol-1-yl]-(4,4-difluoro-cyclohexyl)-acetic acid in 20 ml tetrahydrofuran was added 0.15 g (4.01 mmol) lithium aluminium hydride. After removal of the cooling bath the reaction mixture was stirred for 1.25 h at room temperature. The reaction mixture was poured onto 100 ml aqueous saturated potassium sodium tartrate solution, the phases were separated and the aqueous layer was extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over magnesium sulfate, filtered and evaporated. The remaining oil 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). Light yellow solid (39%). MS (Turbo Spray): m/z=427.1 [M+H].

Provenance & Evidence