Synthesis of Optically Active 1-(1-Phenylethyl)-1H-imidazoles Derived from 1-Phenylethylamine
作者:Grzegorz Mlostoń、Paulina Mucha、Katarzyna Urbaniak、Karolina Broda、Heinz Heimgartner
DOI:10.1002/hlca.200890028
日期:2008.2
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)。