enantiomerically pure 1-(1-phenylethyl)-1H-imidazole 3-oxide 7 in high yield (Schemes 2 and 3). The reactions are carried out either in MeOH or in AcOH. Smooth transformations of the N-oxides into optically active 1-(1-phenylethyl)-1H-imidazoles 10 and 2,3-dihydro-1-(1-phenylethyl)-1H-imidazole-2-thiones 11 are achieved by treatment of 7 with Raney-Ni and 2,2,4,4-tetramethyl-3-thioxocyclobutanone (12),
(R)-或(S)-1-苯基
乙胺(6),
甲醛和α-(羟基亚
氨基)酮5(即3-(羟基亚
氨基)丁丹-2-酮(5a)或2-(羟基亚
氨基)-1,2-
二苯基乙酮(5b)以高产率得到相应的对映体纯的1-(1-苯基乙基)-1 H-
咪唑3-氧化物7(方案2和3)。反应在MeOH或AcOH中进行。N氧化物平稳转化为旋光性1-(1-苯乙基)-1 H-
咪唑10和2,3-二氢-1-(1-苯乙基)-1 ħ
咪唑-2-
硫酮11通过治疗来实现7与阮内-Ni和2,2,4,4-四甲基-3- thioxocyclobutanone(12)(方案4)。