Design and synthesis of new bis-hydrazones and pyridine bis-hydrazones: application in the asymmetric Diels-Alder reaction
作者:David Monge、Antonio Bermejo、Juan Vázquez、Rosario Fernández、José M. Lassaletta
DOI:10.3998/ark.5550190.0014.205
日期:——
The design of two different types of new chiral bis -hydrazones 5 (bidentate N,N ligands, type A ) and pyridine bis-hydrazones 7 ('pincer' N,N,N ligands, type B) is discussed. Preliminary results on the copper(II)-catalyzed Diels-Alder reaction of N-(E)-crotyloxazolidin-2-one ( 8) with cyclopentadiene ( 9) revealed that the (2 S,6 S)-2,6-diphenylpiperidine C2-symmetric substructure in pyridine bis-hydrazone
讨论了两种不同类型的新型手性双腙 5(双齿 N,N 配体,A 型)和吡啶双腙7(“钳形”N,N,N 配体,B 型)的设计。N-(E)-crotyloxazolidin-2-one (8) 与环戊二烯 (9) 的铜 (II) 催化 Diels-Alder 反应的初步结果表明 (2 S,6 S)-2,6-二苯基哌啶吡啶双腙配体 7c 中的 C2 对称亚结构是导致良好对映选择性的关键设计元素。