Asymmetric Proline-Catalyzed Addition of Aldehydes to 3<i>H</i>-Indol-3-ones: Enantioselective Synthesis of 2,3-Dihydro-1<i>H</i>-indol-3-ones with Quaternary Stereogenic Centers
作者:Magnus Rueping、Ramesh Rasappan、Sadiya Raja
DOI:10.1002/hlca.201200498
日期:2012.11
2‐aryl‐substituted 3H‐indol‐3‐ones affords 2,2‐disubstituted 2,3‐dihydro‐1H‐indol‐3‐one derivatives with excellent enantioselectivities. In addition, the synthesis of a chiral derivative, (S)‐2‐(2‐bromophenyl)‐2,3‐dihydro‐2‐(2‐hydroxyethyl)‐1H‐indol‐3‐one, which can be used as an intermediate for the preparation of the natural product hinckdentine A was accomplished with a high level of enantioselectivity.
脯氨酸催化的各种脂肪族醛加成到位阻2-芳基取代的3 H-吲哚-3-酮中,可得到具有出色对映选择性的2,2-二取代的2,3-二氢1 H-吲哚-3-酮衍生物。此外,手性衍生物(S)-2-(2-溴苯基)-2,3-二氢-2-(2-羟乙基)-1 H-吲哚-3-酮的合成可以用作以高水平的对映选择性完成了制备天然产物辛克汀汀A的中间体。