作者:John R. Tabor、Derek C. Obenschain、Forrest E. Michael
DOI:10.1039/c9sc05335b
日期:——
A screen of catalysts revealed that more electron-rich phosphine ligands resulted in higher yields of the desired product, with selenophosphoramides giving the optimal results. A broad range of substrates and functional groups were tolerated and yields were generally good to excellent. For (E)-1,2-disubstituted olefins, diastereoselectivities were always high, giving exclusively anti products. The conditions
提出了一种新的硒代磷酰胺催化的端基和反式1,2-二取代烯烃的加氨反应。该转化成功的关键是引入氟化物清除剂三甲基甲硅烷基三氟甲磺酸盐(TMSOTf),以防止竞争性的同化途径,就像在硒上使用磷酰胺配体来促进所需的取代反应一样。催化剂的筛选表明,更多的富含电子的膦配体导致所需产物的更高产率,硒代磷酰胺给出了最佳结果。可以耐受各种各样的底物和官能团,并且收率通常良好至优异。对于(E)-1,2-二取代的烯烃,非对映选择性始终很高,仅产生抗产物。