The catalytic synthesis of aryl O-glycosides using triaryloxyboranes
摘要:
Triaryloxyboranes worked as highly reactive glycosyl accepters of glycosyl acetates to afford aryl O-glycosides in excellent yields. A catalytic amount of ytterbium(III) trifluoromethanesulfonate activated the formation reaction of aryl O-glycosidic linkages between the glycosyl acetates and triaryloxyboranes. (C) 2001 Elsevier Science Ltd. All rights reserved.
Regio- and Stereoselective Ring Opening of Enantiomerically Enriched 2-Aryl Oxetanes and 2-Aryl Azetidines with Aryl Borates
作者:Ferruccio Bertolini、Stefano Crotti、Valeria Di Bussolo、Franco Macchia、Mauro Pineschi
DOI:10.1021/jo801568a
日期:2008.11.21
The regioselective ringopening of 2-aryl-substituted four-membered heterocyclic rings with phenols, including catechol, was achieved by the use of aryl borates in mild and neutral reaction conditions without the aid of any transition metal catalysts. While N-alkyl azetidines were found not to be reactive, optically active N-tosyl azetidines gave the corresponding beta-aryloxy amines in a racemic form
A conceptually new regioselective and highly syn-stereoselective intermolecular Friedel–Crafts-type O-alkylation of phenols with aryl epoxides by the use of appropriately substituted aryl borates is reported. The carbon–carbon bond formation occurs in neutral and mild conditions without the need for external Lewis acids or transition metal catalysts.
Copper-catalyzed electrophilic amination using N-methoxyamines
作者:Yutaro Fukami、Takamasa Wada、Tatsuhiko Meguro、Noritaka Chida、Takaaki Sato
DOI:10.1039/c5ob02167g
日期:——
Copper-catalyzed electrophilic amination using functionalizedN-methoxyamines, prepared by nucleophilic addition toN-methoxyamides, is reported.
使用功能化的N-甲氧胺进行铜催化的电亲合胺化反应,该N-甲氧胺是通过亲核加成到N-甲氧酰胺制备的。
Thermodynamic Studies and Hydride Transfer Reactions from a Rhodium Complex to BX<sub>3</sub> Compounds
作者:Michael T. Mock、Robert G. Potter、Donald M. Camaioni、Jun Li、William G. Dougherty、W. Scott Kassel、Brendan Twamley、Daniel L. DuBois
DOI:10.1021/ja905287q
日期:2009.10.14
involves both experimental and theoretical determinations of hydride transfer abilities. Thermodynamic hydride donor abilities (DeltaG(o)(H(-))) were determined for HRh(dmpe)(2) and HRh(depe)(2), where dmpe = 1,2-bis(dimethylphosphinoethane) and depe = 1,2-bis(diethylphosphinoethane), on a previously established scale in acetonitrile. This hydride donor ability was used to determine the hydride donor ability
stereoselective direct carbon-carbon coupling of readily available aryl borates with N-protected aryl aziridines provides a method for the synthesis of new 2-(o-hydroxyaryl)-2-aryl ethylamines which can be used, in a novel annulation sequence, to give stereodefined substituted 3-aryl indolines. [reaction: see text]