Enantioselective Synthesis of Benzyl (1<i>S</i>,2<i>R</i>,4<i>R</i>)-4-(<i>tert</i>-Butoxycarbonylamino)-2-(hydroxymethyl)cyclohexylcarbamate Using an Iodolactamization As the Key Step
作者:Carlton L. Campbell、Carla Hassler、Soo S. Ko、Matthew E. Voss、Michael A. Guaciaro、Percy H. Carter、Robert J. Cherney
DOI:10.1021/jo9011249
日期:2009.8.21
An efficient enantioselective synthesis of benzyl (1S,2R,4R)-4-(tert-butoxycarbonylamino)-2-(hydroxymethyl)cyclohexylcarbamate 2, an essential intermediate for a series of potent CCR2 antagonists, is described. The key step in the sequence is an iodolactamization to yield the highly functionalized (1R,2S,4S,5S)-tert-butyl 2-(benzyloxycarbonylamino)-4-iodo-7-oxo-6-azabicyclo[3.2.1]octane-6-carboxylate
描述了有效的对映选择性合成苄基(1 S,2 R,4 R)-4-(叔丁氧基羰基氨基)-2-(羟甲基)环己基氨基甲酸酯2的方法,该中间体是一系列有效CCR2拮抗剂的重要中间体。序列中的关键步骤是碘化内酰胺化,以生成高度官能化的(1 R,2 S,4 S,5 S)-叔丁基2-(苄氧基羰基氨基)-4-碘-7-氧代-6-氮杂双环[3.2 .1] -6-羧酸辛烷酯11。在两步碘化内酰胺化序列中对反应机理的检查导致发现效率提高的单罐转化。