水杨醛/ 2-羟基苯乙酮supported与芳基-/烷基脲或水杨醛/ 2-羟基苯乙酮与4-芳基-/烷基半脲的一锅蒙脱土K-10粘土反应迅速生成3,4-二氢-4-肼基-2 H -在无溶剂微波辐射下,通过中间体水杨醛/ 2-羟基苯乙酮4-芳基-/烷基半咔唑酮(5)的环异构化反应生成苯并[ e ] -1,3-恶嗪-2-酮(9)。在相同条件下,肼(9)易于在氧化铝负载的硫酸铜(II)上进行还原性脱水,以提供2 H-苯并[ e ] -1,3-恶嗪-2-酮(10)。
Salicylhydrazone ligands for enantioselective addition of diethylzinc to aldehydes
摘要:
A family of chiral salicylhydrazones was designed and synthesized for application in asymmetric catalysis. The ability of newly prepared binaphthyl-containing salicylhydrazones as the chiral ligand was examined in the addition of diethylzinc to aldehyde, with the desired product obtained in up to 80% ee. (c) 2007 Elsevier Ltd. All rights reserved.