β-hydroxyphosphonate analogues is described. The use of a nucleoside β-ketophosphonate as the key intermediate allowed both the (R) and (S) isomers of β-hydroxyphosphonate analogues in the pyrimidineseries to be accessed. Such derivatives may be considered as stable mimics of 5
描述了获得核苷 β-羟基膦酸酯类似物的简明途径。使用核苷 β-酮膦酸酯作为关键中间体允许获得嘧啶系列中 β-羟基膦酸酯类似物的 (R) 和 (S) 异构体。这样的衍生物可以被认为是 5
Gold(I)-Catalyzed Reactions of Propargyl Esters with Vinyl Derivatives
作者:Christian A. Sperger、Jørn E. Tungen、Anne Fiksdahl
DOI:10.1002/ejoc.201100291
日期:2011.7
A gold-catalyzed olefin cyclopropanation reaction of propargyl esters with vinylester or vinyl sulfonamide derivatives was investigated for the synthesis of highly substituted cyclopropane derivatives in good diastereoselectivity. By varying the vinyl species, trans-cyclopentenyl esters were selectively formed by a formal [3+2] cycloaddition.
作者:Dominik Gärtner、André Luiz Stein、Sabine Grupe、Johannes Arp、Axel Jacobi von Wangelin
DOI:10.1002/anie.201504524
日期:2015.9.1
unreactive in cross‐coupling reactions which mostly employ more electrophilic halides or activated esters (triflates, tosylates). Acetates are cheap and easily accessible electrophiles but have not been used in cross‐couplings because the strong CO bond and high propensity to engage in unwanted acetylation and deprotonation. Reported herein is a selective iron‐catalyzedcross‐coupling of diverse alkenyl
Reactions of dichlorocarbene and tri-chloromethide with O-alkenyl esters and ethers, N-vinyl amides, and 1-haloalkenes
作者:R.C. De Selms、T.-W. Lin
DOI:10.1016/0040-4020(67)85101-9
日期:1967.1
mixtures due to apparent addition of trichloromethide and dichlorocarbene. In general, the yields of gem-dichlorocyclopropanes increased with increasing alkyl substituents on the alkene substrates. A trend toward increasing yield of gem-dichlorocyclopropanes was also noticed with the following substituents on the alkene substrates: OP(O) (OR)2 < Halogen ≅ OC(O)R < OR ≅ NRC(O)R′. Evidence is presented
α,β-Unsaturated ketones via copper(II) bromide mediated oxidation
作者:James S. Sharley、Ana María Collado Pérez、Estela Espinos Ferri、Amadeo Fernandez Miranda、Ian R. Baxendale
DOI:10.1016/j.tet.2016.04.011
日期:2016.6
effecting a rapid Saegusa-type oxidation of enol acetates is reported. This new method relies on the in situ elimination of an α-bromo intermediate to generate α,β-unsaturated ketones using copper(II) bromide. The methodology developed was applied to a range of substrates including a cyclohexanone, which could be directly converted to the corresponding phenol derivative. A catalytic system in which a