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
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。
Enantioselective Cyanosilylation of Ketones Catalyzed by a Chiral Oxazaborolidinium Ion
作者:Do Hyun Ryu、E. J. Corey
DOI:10.1021/ja050543e
日期:2005.4.1
cyanosilylation of methyl ketones promoted by trimethylsilylcyanide and diphenylmethyl phosphine oxide as co-reactants (to generate Ph(2)MePOTMS(N=C:) as a reactive intermediate). The face selectivity of this reaction parallels that previously observed for the corresponding reaction of aldehydes. A unifying and rational mechanistic explanation is provided for these enantioselectivereactions. Evidence is presented
Stereoselective Synthesis of <i>O</i>-Glycosides with Borate Acceptors
作者:Xiaoxiao Zhao、Zhentao Zhang、Jing Xu、Nengzhong Wang、Nianyu Huang、Hui Yao
DOI:10.1021/acs.joc.3c01011
日期:2023.8.18
borate acceptors in O-glycosylation with glycal donors remains underexplored. Herein, we describe a novel O-glycosylation resulting in the formation of 2,3-unsaturated O-glycosides and 2-deoxy O-glycosides mediated by palladium and copper catalysis, respectively. This O-glycosylation method tolerated a broad scope of trialkyl/triaryl borates and various glycals with exclusive stereoselectivities in high