Electrochemical iodofluorination of electron-deficient olefins
摘要:
Electron-deficient olefins like alpha,beta-unsaturated ester, amide, and phosphonate reacted with iodonium cation species generated by the anodic oxidation of iodide anion in Et3N-5HF/CH3NO2 to form corresponding iodofluorinated compounds in good to moderate yields. The reaction proceeds at room temperature under air atmosphere and constant current conditions. The iodofluorinated products were shown to be useful fluorine-containing building blocks. (C) 2009 Elsevier Ltd. All rights reserved.
Hydrogen-Bonding Thiourea Organocatalysts: The Privileged 3,5-Bis(trifluoromethyl)phenyl Group
作者:Katharina M. Lippert、Kira Hof、Dennis Gerbig、David Ley、Heike Hausmann、Sabine Guenther、Peter R. Schreiner
DOI:10.1002/ejoc.201200739
日期:2012.10
We present evidence that the privileged use of the 3,5-bis(trifluoromethyl)phenylgroup in thiourea organocatalysis is due to the involvement of the ortho-CH bond in the binding event with Lewis-basic sites. We utilized a combination of low-temperature IR spectroscopy, 2D NMR spectroscopy, nano-MS (ESI) investigations, as well as density functional theory computations [M06/6-31+G(d,p), including solvent
我们提供的证据表明,3,5-双(三氟甲基)苯基在硫脲有机催化中的特权使用是由于邻位 CH 键参与与路易斯碱性位点的结合事件。我们结合了低温 IR 光谱、2D NMR 光谱、纳米 MS (ESI) 研究以及密度泛函理论计算 [M06/6-31+G(d,p),包括溶剂校正以及自然键轨道和分子中原子分析]以支持我们对催化剂设计具有影响的结论。
Diastereoselective copper-catalysed 1,4-addition of Grignard reagents to N-enoyl oxazolidinones
Conjugate additions of organometallic reagents to α,β-unsaturated carboxylic acidderivatives give access to numerous β-substituted chiral building blocks. Chiral oxazolidinones serve as useful surrogates of carboxylic function in the asymmetric conjugate addition of Grignardreagents. N-Enoyl oxazolidinones undergo this 1,4-addition with a catalytic amount of copper salt and using either chiral or
Total Syntheses of (+)-Tedanolide and (+)-13-Deoxytedanolide
作者:Joshua R. Dunetz、Lisa D. Julian、Jason S. Newcom、William R. Roush
DOI:10.1021/ja8063205
日期:2008.12.3
13-deoxytedanolide. This led to the decision to pursue the tedanolide synthesis via C(15)-(S)-epimers, since this stereochemical change would destabilize the hemiketal that plagued the attempted synthesis of tedanolide via C(15)-(R) intermediates. However, use of C(15)-(S)-configured intermediates required that the side-chain epoxide be introduced very late in the synthesis, owing to the ease with which
N-Aminoaziridines are potent irreversible inhibitors of galactosidases.
N-氨基环氧乙烷是半乳糖苷酶的有效不可逆抑制剂。
Synthesis of α- and β-Galactopyranose-Configured Isomers of Cyclophellitol and Cyclophellitol Aziridine
作者:Lianne I. Willems、Thomas J. M. Beenakker、Benjamin Murray、Berend Gagestein、Hans van den Elst、Erwin R. van Rijssel、Jeroen D. C. Codée、Wouter W. Kallemeijn、Johannes M. F. G. Aerts、Gijsbert A. van der Marel、Herman S. Overkleeft
DOI:10.1002/ejoc.201402589
日期:2014.9
Cyclophellitol and cyclophellitolaziridine are potent and irreversible mechanism-based inhibitors of retaining β-glucosidases. Alterations in the configuration of these compounds can lead to irreversible inhibition of different classes of retaining glycosidases. We have recently reported on the design of a set of α-galactopyranose-configured cyclophellitol and cyclophellitolaziridine derivatives