Catalytic Enantioselective Synthesis of Atropisomeric Indoles with an NC Chiral Axis
作者:Nobutaka Ototake、Yudai Morimoto、Ayano Mokuya、Haruhiko Fukaya、Yasuo Shida、Osamu Kitagawa
DOI:10.1002/chem.201000243
日期:——
5‐di‐tert‐butyl‐4‐methoxyphenyl)phosphino]‐4,4′‐bi‐1,3‐benzodioxole–PdCl2 [(R)‐SEGPHOS–PdCl2], 5‐endo‐hydroaminocyclization of achiral ortho‐alkynylanilines proceeds in an enantioselective manner to give optically active, axially chiral indoles (see scheme).
至关重要的作用:在(R)-(-)-5,5'-双[di(3,5-二叔丁基-4-甲氧基苯基)膦基] -4,4'-bi-1的存在下,3-苯并二恶唑-PdCl 2 [(R)-SEGPHOS-PdCl 2 ],非手性邻炔基苯胺的5-内-氢氨基环化以对映选择性的方式进行,得到旋光的,轴向手性的吲哚(见方案)。