Enantioselective Diels–Alder reactions of 3-(acyloxy)acrylates
摘要:
Diels-Alder reactions with 3-(acyloxy)acrylates using chiral Lewis acid catalysts have been successfully carried out. These reactions proceed with high enantioselectivity when a chiral Lewis acid derived from Cu(OTf)(2) and a bisoxazoline is used. The facility of the reaction is dependent on the nature of the acyloxy group in the dienophile. (C) 2004 Elsevier Ltd. All rights reserved.
The Diels-Alder reaction, which is a traditional [4 + 2] cycloaddition with two carbon-carbon bond formations, is one of the most powerful tools to synthesize versatile and unique six-membered rings. We show that chiral supramolecular U-shaped boron Lewisacid catalysts promote the unprecedented multiselective Diels-Alder reaction of propargyl aldehyde with cyclic dienes. Independent from the substrate
Diels-Alder 反应是一种传统的 [4 + 2] 环加成反应,具有两个碳-碳键形成,是合成通用且独特的六元环的最强大工具之一。我们表明手性超分子 U 形硼路易斯酸催化剂促进了炔丙醛与环二烯前所未有的多选择性 Diels-Alder 反应。独立于底物控制,对映-、内/外-、π-面-、区域-、位点和底物选择性可以通过本 U 形催化剂进行控制。所得反应产物可用于手性二烯配体和(+)-沙霉素关键中间体的简明合成。这里介绍的结果可能部分有助于开发用于多选择性反应的人工酶样超分子催化剂,
Chiral epoxides as recoverable auxiliaries in the synthesis of optically active sulpinyl dienophiles
作者:Ottorino De Lucchi、Maurizio Buso、Giorgio Modena
DOI:10.1016/s0040-4039(00)95662-4
日期:1987.1
The Diels-Alder addition of the sulfinyl dienophiles derivedfromchiral styrene oxide proceeds highlydiastereoselectively to produce adducts which can be transformed into enantiomeric compounds with recovery of the chiralauxiliary. A general assignment of the stereochemistry of the Diels-Alder cycloaddition of vinyl sulfoxides is proposed.
Enhanced Diels–Alder reactions: on the role of mineral catalysts and microwave irradiation in ionic liquids as recyclable media
作者:Ignacio López、Guadalupe Silvero、María José Arévalo、Reyes Babiano、Juan Carlos Palacios、José Luis Bravo
DOI:10.1016/j.tet.2007.01.031
日期:2007.3
This manuscript explores in detail the combined effect of solid supports or microwave irradiation in ionic liquids on a series of Diels-Alder reactions involving 1,3-cyclopentadiene and numerous dienophiles. (c) 2007 Elsevier Ltd. All rights reserved.