Organocatalytic Asymmetric Neber Reaction for the Synthesis of 2<i>H</i>-Azirine Carboxylic Esters
作者:Shota Sakamoto、Tsubasa Inokuma、Yoshiji Takemoto
DOI:10.1021/ol2026747
日期:2011.12.16
The first enantioselective Neber reaction of β-ketoxime sulfonates catalyzed by a bifunctional thiourea has been developed. The reaction proceeds stereoselectively with 5 mol % of the catalyst to give the 2H-azirine carboxylic esters in good yields with up to 93% ee. In addition, the resulting azirines can be successfully employed in the stereoselective synthesis of di- and trisubstituted aziridines
已经开发了由双官能硫脲催化的β-酮肟磺酸盐的第一个对映选择性Neber反应。用5mol%的催化剂使反应立体选择性地进行,从而以高达93%ee的高收率得到2 H-叠氮基羧酸酯。另外,所得的叠氮基可以成功地用于二和三取代的氮丙啶的立体选择性合成中。