A new and expeditious synthesis of all enantiomerically pure stereoisomers of rosaprostol, an antiulcer drug
作者:Wiesława Perlikowska、Remigiusz Żurawiński、Marian Mikołajczyk
DOI:10.3762/bjoc.12.215
日期:——
overall yield. According to the same protocol, the second stereoisomer (+)-1c was obtained from (-)-3 in 55% overall yield. A slightly improved procedure of the last two steps of the transformation of (+)-3 into (-)-1a allowed an increase in the overall yield to 64%. The remaining two stereoisomers, (-)-1b and (+)-1d, were obtained from (-)-1a and (+)-1c in 71 and 68% yield, respectively, by a two-reaction
由2-(二甲氧基磷酰基)-3-己基环戊酮(3)的对映异构体作为手性底物有效合成了罗沙前列醇(1)(一种抗溃疡药)的四种对映体纯的立体异构体。后者通过用(+)-(R)-1-(1-萘基)乙胺拆分外消旋3获得。(+)-3到罗沙前列醇立体异构体(-)-1a的转化分四个步骤完成,总产率为56%。根据相同的方案,第二立体异构体(+)-1c以55%的总产率从(-)-3获得。将(+)-3转化为(-)-1a的最后两个步骤稍作改进,可使总收率提高到64%。剩下的两个立体异构体(-)-1b和(+)-1d是通过两个反应序列从(-)-1a和(+)-1c分别以71%和68%的产率获得的,