Conformational and Electronic Variations in 1,2‐ and 1,5a‐Cyclophellitols and their Impact on Retaining α‐Glucosidase Inhibition
作者:Tim P. Ofman、Jurriaan J. A. Heming、Alba Nin‐Hill、Florian Küllmer、Elisha Moran、Megan Bennett、Roy Steneker、Anne‐Mei Klein、Gijs Ruijgrok、Ken Kok、Zach W. B. Armstrong、Johannes M. F. G. Aerts、Gijsbert A. van der Marel、Carme Rovira、Gideon J. Davies、Marta Artola、Jeroen D. C. Codée、Herman S. Overkleeft
DOI:10.1002/chem.202400723
日期:——
Twenty configurational and functional cyclophellitol analogues were synthesized and evaluated on their potency as retaining α-glucosidase inhibitors. The inhibitory properties of the focused library of compounds were determined on human α-glucosidases after which we mapped the conformationalfreeenergy landscapes of the most active compounds. Our results add to the growing list of covalent and competitive
Stereocontrolled <i>O</i>-Glycosylation with Palladium-Catalyzed Decarboxylative Allylation
作者:Shaohua Xiang、Jingxi He、Yu Jia Tan、Xue-Wei Liu
DOI:10.1021/jo502078c
日期:2014.12.5
The Pd-pi-allyl intermediate in an electron-rich glycal system with poor reactivity is employed as an efficient glycosyl donor. Starting from glucal derived carbonate, various O-glycosides were formed via a palladium-catalyzed reaction through a tandem decarboxylation, proton abstraction, and nucleophilic addition, in good yields with excellent selectivity. Iterative glycosylation with the same strategy may provide an access to complex oligosaccharides.
Selective cleavage of primary MPM ethers with TMSI/Et3N
A useful method for the selective cleavage of primary MPM ethers by using TMSI/Et3N is described. Other protective groups such as secondary MPM ethers, silyl ethers, and benzylidene acetal were stable under the reaction conditions. (C) 2009 Elsevier Ltd. Ail rights reserved.
Stereodivergent synthesis of diastereoisomeric carba analogs of glycal-derived vinyl epoxides: A new access to carbasugars
作者:Ileana Frau、Valeria DI Bussolo、Lucilla Favero、Mauro Pineschi、Paolo Crotti
DOI:10.1002/chir.21003
日期:2011.10
stereoselective synthesis of diasteroisomeric vinyl epoxides (−)‐2α and (−)‐2β, the carba analogs of D‐galactal and D‐allal‐derived vinyl epoxides 1αand 1β, has been elaborated starting from tri‐O‐acetyl‐D‐glucal. The key step of this synthesis is an application of the known Claisen thermal rearrangement of a glucal derivative, the vinyl allyl ether (+)‐3b, which allows to switch the glycal structure into the