A safe and practical strategy has been developed for the large-scale preparation of imidazole 7 . The key transformation involved the Wolff−Kishner reduction of the sterically demanding neopentyl-trifluoromethylcyclopropyl imidazole ketone 8 . The described process provided the desired product in 74% overall yield without recourse to chromatographic purification. Safety considerations which allowed for the reaction to be conducted safely on kilogram scale are discussed.
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Kuethe et al. (2009) studied this question.