Copper bis(oxazolines) as catalysts for stereoselective aziridination of styrenes with N-tosyloxycarbamates
作者:Hélène Lebel、Michaël Parmentier、Olivier Leogane、Karen Ross、Cédric Spitz
DOI:10.1016/j.tet.2012.02.044
日期:2012.4
styrenes. Subsequent ring-opening reactions of styrene-derived aziridines at the benzylic position were observed with various oxygen and nitrogen nucleophiles under Lewis acid catalysis affording the corresponding products with complete inversion of stereochemistry. The strategy was used to synthesize the β-blocker, (R)-nifenalol.
已经开发了Cu(I)催化的与手性N-甲苯磺酰氧基氨基甲酸酯的苯乙烯的不对称叠氮化。观察到双立体分化,并且N-甲苯磺酰氧基氨基甲酸酯取代基和双(恶唑啉)配体均对产率和非对映选择性具有显着影响。使用缺电子的苯乙烯可获得最佳的叠氮化效果。在路易斯酸催化下,用各种氧和氮亲核试剂观察到了苯乙烯衍生的氮丙啶在苄基位置的随后开环反应,从而提供了具有完全立体化学转化的相应产物。该策略用于合成β-受体阻滞剂(R)-尼芬洛尔。