(1′S,5R,S)-(1′-phenyleth-1′-yl)-5-iodomethyl-imidazolines 4a,b have been synthesised and easily resolved by silica gel chromatography. The correlation between the configuration and the 1H NMR chemical shifts allows to assign the configuration at the C-5 of these intermediates. Each pure diastereomer has been converted to R(−)- and to S(+)-1,2-propyldiamine, respectively.
(1'S,5R,S)-(1'-苯基乙-1'-基)-5-
碘甲基-
咪唑啉4a,b已经合成,并且容易通过
硅胶色谱法拆分。构型与1 H NMR
化学位移之间的相关性允许在这些中间体的C-5处指定构型。每个纯的非对映异构体已分别转化为R(-)-和S(+)-1,2-丙基二胺。