Regioselective Synthesis of Difluorinated <i>C</i>-Furanosides Involving a Debenzylative Cycloetherification
作者:Julien A. Delbrouck、Valentin N. Bochatay、Abdellatif Tikad、Stéphane P. Vincent
DOI:10.1021/acs.orglett.9b01878
日期:2019.7.19
A highly regioselective synthesis of valuable gem-difluorinated C-furanosides from unprotected aldoses via a debenzylative cycloetherification (DBCE) reaction induced by diethylaminosulfur trifluoride is descibed. The scope and limitations of this DBCE reaction are described using a series of commercially available pentoses and hexoses to afford, without selective protection/deprotection sequences
[EN] HALOALKYL FUCOSE-CONTAINING SELECTIN ANTAGONISTS<br/>[FR] ANTAGONISTES DE LA SÉLECTINE CONTENANT DE L'HALOALKYL-FUCOSE
申请人:GLYCOMIMETICS INC
公开号:WO2017205269A1
公开(公告)日:2017-11-30
Compounds of Formula (I), compositions, and methods for treatment and/or prevention of at least one disease, disorder, and/or condition by inhibiting binding of an E-selectin to an E-selectin ligand are disclosed. For example, haloalkyl fucose-containing E-selectin antagonists and compositions comprising at least one such agent are described.
The reduction of benzylidene derivatives of pentose diethyl dithioacetals with lithium aluminium hydride-aluminium trichloride
作者:S.Prahlada Rao、T.Bruce Grindley
DOI:10.1016/0008-6215(91)84088-v
日期:1991.9
O -benzylidene derivatives of pentose diethyldithioacetals were reduced to di- O -benzyl pentose diethyldithioacetals in high yield. In three of the five cases studied, single products were obtained: 2,3:4,5-di- O -benzylidene- d -arabinose diethyldithioacetal gave the 2,5-di- O -benzyl derivative; 2,4:3,5-di- O -benzylidene- d -xylose diethyldithioacetal, the 2,3-di- O -benzyl derivative; and
Synthesis of D-<i>manno</i>-heptulose via a cascade aldol/hemiketalization reaction
作者:Yan Chen、Xiaoman Wang、Junchang Wang、You Yang
DOI:10.3762/bjoc.13.79
日期:——
A [4 + 3] synthesis of D-manno-heptulose is described. The cascade aldol/hemiketalization reaction of a C4 aldehyde with a C3 ketone provides the differentially protected ketoheptose building block, which can be further reacted to furnish target D-manno-heptulose.
Natural methyl (−)-shikimate has been synthesized fromD-lyxose, employing a double carbon–carbon bond formation of 2,3,4-tri-O-benzyl-5-O-mesyl-D-lyxose with a dianion of dimethyl malonate as a key reaction.