同一の不斉源から両鏡像体を高光学純度で得る手法:触媒的不斉炭素‐炭素結合形成反応を中心に

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タイトル別名
  • New Approach for Complete Reversal of Enantioselection Using Schiff Base Ligand
  • ドウイツ ノ フセイゲン カラ リョウ キョウゾウタイ オ コウ コウガク ジュンド デ エル シュホウ ショクバイテキ フセイ タンソ タンソ ケツゴウ ケイセイ ハンノウ オ チュウシン ニ
  • 触媒的不斉炭素-炭素結合形成反応を中心に

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抄録

Attempt for obtaining both enantiomers in high enantiomeric excess is attractive and important challenges, because it is often the case that each enantiomer exhibits different bioactivity. Since our first report on the chiral Schiff base-Ti (O-i-Pr) 4-catalyzed trimethylsilylcyanation of aldehydes in 1991 (Aldimine type; the 1 st generation), this catalyst system has been proven to be efficient in a variety of asymmetric reactions. One of such reactions is the enantioselective addition of diketene to aldehydes. We succeeded in obtaining optically active 5-hydroxy-3-ketoesters in high optical yield (Ketimine type; the 2 nd generation). Herein, we report the first example of complete reversal of enantioselection using oxazoline-containing Schiff bases derived from L-serine, that is, from one stereogenic center of L-serine, both enantiomers of 5-hydroxy-3-keto-esters were obtained in high enantiomeric excess (Oxazoline containing type; the 3 rd generation).

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