Enantioselective Darzens reaction using organoselenide–lithium hydroxide complexes
摘要:
Asymmetric Darzens reaction catalyzed by chiral selenides is described. A novel Lewis acid/Bronsted base catalyst formed by C-2 symmetric chiral selenide-bearing isoborneol skeletons, which were readily prepared from (1S)-10-camphorsulfonic acid, and LiOH promoted the reaction of phenacyl bromide with aldehydes to afford the desired trans oxiranes with up to 62% ee. (C) 2010 Elsevier Ltd. All rights reserved.
Enantioselective Darzens reaction using organoselenide–lithium hydroxide complexes
摘要:
Asymmetric Darzens reaction catalyzed by chiral selenides is described. A novel Lewis acid/Bronsted base catalyst formed by C-2 symmetric chiral selenide-bearing isoborneol skeletons, which were readily prepared from (1S)-10-camphorsulfonic acid, and LiOH promoted the reaction of phenacyl bromide with aldehydes to afford the desired trans oxiranes with up to 62% ee. (C) 2010 Elsevier Ltd. All rights reserved.