Diazo Reagents in Copper(I)-Catalyzed Olefination of Aldehydes
作者:Hélène Lebel、Michaël Davi
DOI:10.1002/adsc.200800381
日期:2008.10.6
The olefination of aldehydes to synthesize unsaturated ketones, esters, amides and phosphonates using diazo reagents and triphenylphosphine in the presence of copper(I) iodide as catalyst, is described. Good to excellent E:Z selectivities as well as yields were obtained for a large variety of aliphatic, aromatic and heteroaromatic aldehydes. The reaction showed also an excellent functional group compatibility
One-Pot Synthesis of α,β-Unsaturated Esters, Ketones, and
Nitriles from Alcohols and Phosphonium Salts
作者:Xiaochun Yu、Shun Wang、Weijie Ding、Juan Hu、Huile Jin
DOI:10.1055/s-0036-1590904
日期:2018.1
reacted not only with benzylic and heteroaromatic alcohols, but also with aliphatic alcohols, forming the corresponding α,β-unsaturated esters, ketones, and nitriles in moderate to excellent yields. A general method for the synthesis of α,β-unsaturated esters, ketones, and nitriles is successfully achieved by a one-pot copper-catalyzed oxidation with O2 in air as oxidant. The solvent mixture of acetonitrile
Facile synthesis of α, β-unsaturated esters through a one-pot copper-catalyzed aerobic oxidation-Wittig reaction
作者:Cheng Ren、Zhenyu Shi、Weijie Ding、Zhiqing Liu、Huile Jin、Xiaochun Yu、Shun Wang
DOI:10.1016/j.tetlet.2017.09.020
日期:2018.1
An efficient one-pot synthesis of α, β-unsaturated estersthrough the aerobic oxidation – Wittig tandem reaction of alcohols and phosphorous ylide is developed. This new method operates under mild reaction conditions, and uses CuI/TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidine-N-oxyl) as co-catalyst and air (O2) as the oxidant. It tolerates a wide range of functionalized benzylic alcohol and aliphatic
N,N,N′,N′-Tetramethylenediamine dioxide (TMEDAO<sub>2</sub>) facilitates atom economical/open atmosphere Ley–Griffith (TPAP) tandem oxidation-Wittig reactions
作者:Christopher D. G. Read、Peter W. Moore、Craig M. Williams
DOI:10.1039/c5gc01346a
日期:——
N,N,N′,N′-Tetramethylethylenediamine dioxide (TMEDAO2) was explored as a more atom economical co-oxidant for the Ley–Griffith oxidation of alcohols to aldehydes.
N, N, N′, N′-四甲基乙二胺二氧化物(TMEDAO2)被探讨作为 Ley–Griffith 氧化醇制醛反应中更具原子经济性的辅助氧化剂。
Ethyl (benzothiazol-2-ylsulfonyl)acetate: a new reagent for the stereoselective synthesis of α,β-unsaturated esters from aldehydes
作者:Paul R. Blakemore、Danny K. H. Ho、W. Mieke Nap
DOI:10.1039/b500713e
日期:——
The title reagent engaged in the modified Julia olefination with aldehydes under mild reaction conditions (DBU, CH(2)Cl(2), rt or -78 degrees C) to yield alpha,beta-unsaturated esters; aryl aldehydes and aliphatic aldehydes possessing significant chain branching elements gave trans alkene products with high stereoselectivity (E : Z up to >98 : 2), while straight chain aliphatic aldehydes gave cis products