Imidazole → HCID 11427123, compound

Participants

Reaction Conditions

Reaction Steps

In a 100 ml three necked flask fitted with a magnetic stirrer, under inert atmosphere, distilled tetramethyl-chloro-enamine (1.1 ml, 8.5 mmol) is added to a solution of 4-(3-azido-2,4-difluoro-phenyl)-1-hydroxymethyl-pyrrolidin-2-one a15 (1.9 g, 7.08 mmol) in CH2Cl2 (45 ml) at 0° C. After 3.5 h, the mixture is transferred via a canula into a second three necked flask fitted with a magnetic stirrer, under inert atmosphere, containing a solution of imidazole (2.4 g, 35.4 mmol) in CH2Cl2 (45 ml) at room temperature. The temperature raised up to 28° C. and a precipitate appears. After 1 h, the reaction mixture is filtered, evaporated in vacuo, diluted with CH2Cl2 and the organic layer is washed with water, dried over MgSO4, filtered and evaporated in vacuo. The residue is purified by chromatography on silicagel (CH2Cl2/EtOH/NH4OH: 93.5/06/0.5 (v/v)) to afford 4-(3-azido-2,4-difluoro-phenyl)-1-imidazol-1-ylmethyl-pyrrolidin-2-one 5 (1.66 g, 75%). The racemate is resolved by preparative chiral chromatography (Chiralpak AD, benzine/EtOH) and the enantiomers are recrystallized successively in toluene and AcOEt to afford the two enantiomers 6 (first eluted) and 7 (second eluted) as white solids (0.5 g and 0.45 g).

Provenance & Evidence