Vinyl nosylates as partner in copper and silver co-catalyzed Sonogashira cross-coupling reactions
作者:Nicolas P. Cheval、Barbara Hoffmann、Anna Dikova、Fatih Sirindil、Philippe Bertus、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1016/j.tet.2018.10.017
日期:2018.12
Vinylnosylates, readily obtained from β-dicarbonyl derivatives, could be efficiently engaged in Sonogashira cross-couplingreactions, either cocatalyzed by copper or silver salts. The para-nitrobenzenesulfonate (nosylate) group allows this coupling to be performed under very mild conditions (room temperature). These new leaving group and mild conditions could be applied to the synthesis of acetylenic
Handy Protocols using Vinyl Nosylates in Suzuki-Miyaura Cross-Coupling Reactions
作者:Anna Dikova、Nicolas P. Cheval、Aurélien Blanc、Jean-Marc Weibel、Patrick Pale
DOI:10.1002/adsc.201500682
日期:2015.12.14
Vinylnosylates derived from 1,3-dicarbonyl compounds could be engaged in Suzuki–Myaura cross coupling reactions with aryl-, vinyl- and methylboronic acids or trifluoborate derivatives at room temperature in the presence of 2 mol% of [1,1′-bis(diphenylphosphino)ferrocene]dichloropalladium(II) [PdCl2(dppf)]. One-pot procedures have been set up for practical and efficient nosylation–cross-coupling reactions
An expedient copper-catalysed asymmetric synthesis of γ-lactones and γ-lactams. Application to the synthesis of lucidulactone A
作者:O. Stephen Ojo、David L. Hughes、Christopher J. Richards
DOI:10.1039/d3ob00563a
日期:——
The parent Josiphos ligand gave excellent ee values (95–99%) and good yields (60–97%) in the copper-catalysed asymmetric conjugate reduction of β-aryl α,β-unsaturated lactones and lactams with PMHS. The substrates were obtained from stereospecific copper-catalysed addition of arylboronic acids to alkynoates followed by deprotection and cyclisation. The acyclic lactam precursors also underwent reduction
母体 Josiphos 配体在铜催化的 β-芳基 α,β-不饱和内酯和内酰胺与 PMHS 的不对称共轭还原反应中具有优异的 ee 值 (95–99%) 和良好的产率 (60–97%)。底物是通过铜催化的立体定向加成将芳基硼酸加成炔酸酯,然后脱保护和环化获得的。无环内酰胺前体也经历了还原,具有良好的 ee 值 (83–85%) 和收率 (79–95%)。这种不对称还原方法的应用包括天然产物 lucidulactone A 的合成。