A palladium-catalyzed four-component cascade reaction of carbon dioxide, amines, allenyl ethers, and aryl iodides has been developed for the first time. The novel reaction allows simultaneous construction of three different new bonds (C–N, C–O, and C–C) in a single step, affording an efficient method for the synthesis of a variety of highly functionalized acyclic O,O-acetals. Excellent chemo- and regioselectivity
Microwave Promoted Rapid Isomerisation of Propargyl Ethers into Allenyl Ethers
作者:Firouz Matloubi Moghaddam、Rahdar Emami
DOI:10.1080/00397919708005453
日期:1997.12
Abstract: Aryl or alkyl propargyl ethers have been isomerized efficiently with good to excellent yield into corresponding allenylethers in the presence of potassium tert-butoxide under the microwave irradiation.
Site-selective and regioselective Diels–Alder reaction of allenyl aryl ethers
作者:Firouz Matloubi Moghaddam、Mostafa Kiamehr
DOI:10.1007/s00706-010-0406-1
日期:2010.12
AbstractThe site-selectivity and regioselectivity of Diels–Alderreactions of allenyl aryl ethers with cyclopentadiene and acrolein were studied. While cyclopentadiene (as an electron-rich diene) only reacted with the external doublebond of allenyl aryl ethers to provide the site-selective normal electron demand Diels–Alder cycloadducts, acrolein (as an electron-deficient diene) reacted with the C1–C2
A Pd−H/Isothiourea Cooperative Catalysis Approach to
<i>anti</i>
‐Aldol Motifs: Enantioselective α‐Alkylation of Esters with Oxyallenes**
作者:Hua‐Chen Lin、Gary J. Knox、Colin M. Pearson、Chao Yang、Veronica Carta、Thomas N. Snaddon
DOI:10.1002/anie.202201753
日期:2022.6.20
Cooperation between isothiourea and Pd catalysts enables the preparation of anti-aldol products via enantioselective alkylation of esters with oxyallenes. Key to the successful development of this method was the recognition that Pd−H intermediates could be leveraged within this cooperative framework giving access to oxygen-substituted π(allyl)Pd intermediates. Preliminary deuterium-tracking experiments
Copper-Catalyzed Regio- and Stereoselective Three-Component Coupling of Allenyl Ethers with <i>gem</i>-Dichlorocyclobutenones and B<sub>2</sub>pin<sub>2</sub>
and stereoselective difunctionalization of allenes with allenyl ethers, bis(pinacolato)diboron, and gem-dichlorocyclobutenones as electrophiles was reported, yielding a variety of highly functionalized cyclobutenone products tethering with an alkenylborate fragment. The polysubstituted cyclobutenone products also underwent diverse transformations.