Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetric oxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
已经研究了在铜催化的芳基苄基,芳基烷基和烷基苄基硫化物的不对称氧化中的立体效应和电子效应。直接连接到硫上的芳基的存在对于提供具有高对映选择性的亚砜是必不可少的,2-萘基苄基亚砜具有高达97%ee的电子,这是迄今为止铜催化的不对称亚砜氧化所达到的最高对映选择性。与此相反,苄基取代基可以通过在空间上可比基团与对映选择性上没有影响取代。的取代的芳基苄基硫化物铜 - 介导的氧化导致显示在相当或更低的对映选择性,以与未取代的苄基苯基硫醚获得的那些适度立体和电子效应。