Montmorillonite K10 Clay-Microwave Assisted Isomerisation of Acetates of the Baylis-Hillman Adducts: A Facile Method of Stereoselective Synthesis of (E)-Trisubstituted Alkenes
作者:Ponnusamy Shanmugam、Paramasivan Raja Singh
DOI:10.1055/s-2001-16040
日期:——
Montmorillonite K10-microwave assisted stereoselective isomerisation of acetates of the Baylis-Hillman adducts furnished (E)-trisubstituted alkenes in high yields. A comparative study of this reaction with Mont-K10, ion-exchanged clay (Fe3+-Mont-K10) and acid treated regional natural Kaolinite clay and the efficiency of these clays in this reaction is described.
Studies on montmorillonite K10-microwave assisted isomerisation of Baylis–Hillman adduct. Synthesis of E-trisubstituted alkenes and synthetic application to lignan core structures by vinyl radical cyclization
作者:Ponnusamy Shanmugam、Paramasivan Rajasingh
DOI:10.1016/j.tet.2004.07.067
日期:2004.10
The isomerisation of acetates from the Baylis–Hillman adducts with Mont.K10 clay-microwave combination furnished E-trisubstituted alkenes in high yield. The simple Baylis–Hillman adducts with trimethyl orthoformate and unsaturated alcohols under clay catalytic condition gave densely functionalised-isomerized products under solvent free condition. Application of the propargyl derivatives thus obtained
Palladium-catalyzed α-regioselective allylic amination of Morita–Baylis–Hillman acetates with simple aromatic amines
作者:Yan Wang、Li Liu、Dong Wang、Yong-Jun Chen
DOI:10.1039/c2ob25976a
日期:——
An efficient allylic amination of Morita–Baylis–Hillman acetates with simplearomaticamines provided good yields with excellent α-regioselectivity (up to exclusive α-product) under the catalysis of Pd2(dba)3/ferrocene-type diphosphine ligand.
An enantioselective radical alkylation of 4-alkyl-1,4-dihydropyridines with Morita–Baylis–Hillman (MBH) adducts has been reported. The SN2-type products are predominant. This reaction is enabled by dual photoredox/palladiumcatalysis. The alkylation products are provided in good yields with good regio- and enantioselectivity. The use of Ding’s spiroketal-based bis(phosphine) (SKP) ligand is crucial
已经报道了 4-烷基-1,4-二氢吡啶与 Morita-Baylis-Hillman (MBH) 加合物的对映选择性自由基烷基化。S N 2 型产品占主导地位。该反应是通过双光氧化还原/钯催化实现的。烷基化产物以良好的产率和良好的区域选择性和对映选择性提供。Ding 的基于螺缩酮的双(膦)(SKP)配体的使用对于实现令人满意的区域选择性和对映选择性至关重要。生成的 α,β-不饱和酯可以很容易地还原为合成有用的手性烯丙醇。
Enantioselective and<i>α</i>-Regioselective Allylic Amination of Morita-Baylis-Hillman Acetates with Simple Aromatic Amines Catalyzed by Planarly Chiral Ligand/Palladium Catalyst
作者:Yan Wang、Tao Zhang、Li Liu
DOI:10.1002/cjoc.201200771
日期:2012.10.30
An asymmetric allylic amination of Morita‐Baylis‐Hillman acetates with simple aromatic amines catalyzed by planarly chiral ligand/palladium‐catalyst was developed in good yield with excellent α‐regioselectivity (α/γ up to 30:1) and moderate enantioselectivity (up to 70% ee).