Highly Stereoselective Synthesis of 1,3-Dienes through an Aryl to Vinyl 1,4-Palladium Migration/Heck Sequence
作者:Tian-Jiao Hu、Meng-Yao Li、Qian Zhao、Chen-Guo Feng、Guo-Qiang Lin
DOI:10.1002/anie.201801963
日期:2018.5.14
An efficient aryl to vinyl 1,4‐palladium migration/Heck sequence was developed for the stereoselectivesynthesis of 1,3‐dienes. High stereoselectivity was observed not only for 1,3‐dienes bearing two similar aryl groups at terminal positions, but also for those with configurations shown to be unfavorable with previous methods.
Fully palladium/copper catalytic oxidative cross-coupling of acrylates with α-methylstyrene was performed in a DMSO/AcOH (1:1) mixture at 60 °C in the air. This improves previous procedures which employed stoichiometric amounts of copper and oxygen. Thus various acrylates were effectively coupled to α-methylstyrene giving the expected compounds in moderate to good yields (44%–65%) as a mixture of E and Z isomers.
丙烯酸酯与 α-甲基苯乙烯的全钯/铜催化氧化交叉偶联反应是在 DMSO/AcOH (1:1) 混合物中于 60 °C 空气中进行的。这改进了以往采用铜和氧的化学计量方法。因此,各种丙烯酸酯都能有效地与α-甲基苯乙烯偶联,并以中等至良好的收率(44%-65%)得到预期的 E 和 Z 异构体混合物。
Reactions of .pi.-allylic palladium intermediates with amines
作者:Francis G. Stakem、Richard F. Heck
DOI:10.1021/jo01306a009
日期:1980.8
Xu, Yun-He; Lu, Jun; Loh, Teck-Peng, Journal of the American Chemical Society, 2009, vol. 131, p. 1372 - 1373
作者:Xu, Yun-He、Lu, Jun、Loh, Teck-Peng
DOI:——
日期:——
Rhodium-catalyzed allyl transfer from homoallyl alcohols to acrylate esters via retro-allylation
Retro-allylation of homoallyl alcohols by rhodium catalysts occurs to generate allylrhodium species. Insertion of acrylate esters to the allylrhodiums proceeds to give the corresponding 2,5-hexadienoate esters in situ. Subsequent isomerization or iterative 1,4-addition takes place in the same pots to furnish the corresponding 2,4-hexadienoate esters or triesters in good yields. (c) 2007 Elsevier Ltd. All rights reserved.