A novel method for the synthesis of epoxydibenzo[b,f][1,5]diazocines exhibiting a V-shaped molecular architecture is reported. The unique approach is based on unprecedented base-catalyzed, solvent-free autocondensation and cross-condensation of fluorinated o-aminophenones. The structure of the newly synthesized diazocines was confirmed independently by X-ray analysis and chiroptical methods. The rigidity
报道了一种合成具有 V 形分子结构的环氧二苯并 [ b , f ] [1,5]重氮辛的新方法。这种独特的方法基于前所未有的碱催化、无溶剂自缩合和氟化邻苯二甲酸的交叉缩合-氨基苯酮。通过 X 射线分析和手性光学方法独立地证实了新合成的重氮辛的结构。重氮辛支架的刚性允许将外消旋体分离成单个对映异构体,这些对映异构体在高达 140 °C 时具有热稳定性。此外,通过进行一系列典型的转化,包括过渡金属催化的反应,在不影响双半胺亚基的情况下进行,证明了重氮辛支架的惰性。
Catalytic Enantioselective α-Oxysulfonylation of Ketones Mediated by Iodoarenes
作者:Sabine M. Altermann、Robert D. Richardson、T. Keri Page、Ruth K. Schmidt、Edward Holland、Umal Mohammed、Shauna M. Paradine、Andrew N. French、Christine Richter、A. Masih Bahar、Bernhard Witulski、Thomas Wirth
DOI:10.1002/ejoc.200800741
日期:2008.11
alpha-oxysulfonylation of ketones catalysed by enantioenriched iodoarenes using mCPBA as stoichiometric oxidant is reported to give useful synthetic intermediates in good yield and modest enantioselectivity. We believe this to be the first report of an enantioselective organocatalytic reaction involving hypervalent iodine reagents which should open up a new field for enantioselective organocatalysis of oxidation
A new type of arylamido ligands with an intramolecular coordinating ortho-ether-substituent (i.e. a O,N− chelating ligand) is introduced. The achiral and chiral 4-coordinate dimethyl aluminium complexes [2-ROC6H4NR′]AlMe2 (4a: R=R′=Cy; 4b: R=(−)-menthyl, R′=Cy, 4c: R=(−)-menthyl, R′=CPh3) have been prepared by reaction of the appropriate amido Li salt with ClAlMe2. Complex 4a could also be obtained