Light-Mediated Cross-Coupling of Anomeric Trifluoroborates
作者:Eric M. Miller、Maciej A. Walczak
DOI:10.1021/acs.orglett.1c01035
日期:2021.6.4
Stereoselective reactions at the anomeric carbon constitute the cornerstone of preparative carbohydrate chemistry. Here, we report stereoselective C-arylation and etherification reactions of anomeric trifluoroborates derived from BMIDA esters. These reactions are characterized by high anomeric selectivities for 2-deoxysugars and broad substrate scope (24 examples), including disaccharides and trifluoroborates
Highly Stereospecific Cross-Coupling Reactions of Anomeric Stannanes for the Synthesis of C-Aryl Glycosides
作者:Feng Zhu、Michael J. Rourke、Tianyi Yang、Jacob Rodriguez、Maciej A. Walczak
DOI:10.1021/jacs.6b07891
日期:2016.9.21
We demonstrate that configurationally stable anomeric stannanes undergo a stereospecific cross-coupling reaction with aromatic halides in the presence of a palladium catalyst with exceptionally high levels of stereocontrol. In addition to a broad substrate scope (>40 examples), this reaction eliminates critical problems inherent to nucleophilic displacement methods and is applicable to (hetero)aromatics
Zinc-Mediated Synthesis of α-<i>C</i>-Glycosides from 1,2-Anhydroglycosides
作者:Song Xue、Kai-Zhen Han、Lin He、Qing-Xiang Guo
DOI:10.1055/s-2003-38751
日期:——
α-C-Glycosides have been prepared by the addition of organozinc reagents to glycal epoxides. Dialkyl and diaryl zinc reagents in the presence of CF3COOH provide the corresponding α-glycosides in 53-82% yields. Organozinc chlorides RZnCl formed by the reaction RLi with zinc chloride can also be successfully applied to this coupling reaction with high α-selectivity.
作者:Shawn P. Allwein、Jason M. Cox、Brett E. Howard、Henry W.B. Johnson、Jon D. Rainier
DOI:10.1016/s0040-4020(02)00057-1
日期:2002.3
This manuscript describes the synthesis of fused polycyclic ethers from the coupling of C-glycoside forming reactions with ring closing metathesis and acid mediated annulation reactions. (C) 2002 Elsevier Science Ltd. All rights reserved.
Aluminum- and Boron-Mediated C-Glycoside Synthesis from 1,2-Anhydroglycosides
作者:Jon D. Rainier、Jason M. Cox
DOI:10.1021/ol006286u
日期:2000.8.1
[GRAPHICS]This letter describes a single flask strategy to the synthesis of a alpha-C-glycosides from glycals. This protocol couples a glycal epoxidation reaction with a C-2 alkoxy-directed carbon-carbon bond forming reaction.