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.
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
Photocatalytic Metal Hydride Hydrogen Atom Transfer Mediated Allene Functionalization by Cobalt and Titanium Dual Catalysis
作者:Huaipu Yan、Qian Liao、Yuqing Chen、Gagik G. Gurzadyan、Binghui Lu、Chao Wu、Lei Shi
DOI:10.1002/anie.202302483
日期:2023.6.12
Reported is on the photo Co metal hydride hydrogen atom transfer (MHAT) reaction for chemoselective allene functionalization by using Co-porphines as catalysts and the Hantzsch ester as an H atom and electron donor. The merger of Co MHAT and Ti catalysis under photoredox conditions enabled successful carbonyl allylation, providing access to valuable β-functionalized homoallylic alcohols with exceptional
报道了通过使用 Co-卟啉作为催化剂和 Hantzsch 酯作为 H 原子和电子供体,用于化学选择性丙二烯功能化的照片 Co 金属氢化物氢原子转移 (MHAT) 反应。在光氧化还原条件下,Co MHAT 和 Ti 催化的结合使羰基烯丙基化反应成功,为获得具有特殊区域选择性和非对映选择性的有价值的 β-官能化高烯丙醇提供了途径。