Diesterification of 3-[(β-Cyclodextrinyl)succinamido]propane-1,2-diol Catalysed by Lipase: Diastereoselectivity or Tridimensional Substrate Specificity?
catalyzed by immobilized lipase from Mucor miehei occurred with very different conversions of the two diastereoisomers [(R)- or (S)-amidopropanediol]. The highest conversion observed with the (S)-amidopropanediol can be related to either lipase diastereoselectivity or substrate specificity. To investigate the diastereoselectivity of the lipase, diastereoisomers of the methylated β-cyclodextrin were replaced
Linear poly(amide triazole)s derived from <scp>d</scp>
-glucose
作者:Inmaculada Molina-Pinilla、Manuel Bueno-Martínez、Khalid Hakkou、Juan A. Galbis
DOI:10.1002/pola.27038
日期:2014.3.1
The click reaction between azides and alkynes is been increasingly employed in the preparation of polymers. In this article, we describe the synthesis and click polyaddition reaction of a new A‐B‐type amide monomer—prepared from d‐glucose as renewable resource—containing the alkyne and azide functions. Both Cu(I)‐catalyzed and metal‐free click polymerization methods were used to prepare glucose‐derived
Synthesis of Guanidines From Azides: A General and Straightforward Methodology In Carbohydrate Chemistry
作者:Andrés G. Santana、Cosme G. Francisco、Ernesto Suárez、Concepción C. González
DOI:10.1021/jo100876r
日期:2010.8.6
The ability of the guanidinylating reagent N′,N′′-diBoc-N-triflyl-guanidine (GN-Tf) to react with in situ formed free amines from azides in carbohydrate scaffolds was explored. This reaction proved to be an efficient method to prepare guanidine derivatives in a one-pot manner with good to excellent yields, either with primary or secondary azides with different substitution patterns. Labile protecting
Synthesis of 1,4‐Disubstituted 1,2,3‐Triazoles from Terminal Vinyl Sulfones in Ionic Liquid: A Metal‐Free Eliminative Azide‐Olefinic Cycloaddition Route to Triazolyl Carbohydrates and Triazole‐linked Bissaccharides
作者:Kumares Sarkar、Tanmaya Pathak
DOI:10.1002/ejoc.202200189
日期:2022.5.13
Eliminative Azide-Olefinic Cycloaddition strategy has been utilized for the metal-free regioselective synthesis of 1,4-disubstituted1,2,3-triazoles from terminal vinyl sufones in ionic liquid water mixture at 100oC. Both non-carbohydrate and carbohydrate-based terminal vinyl sulfones afforded different 1,4-disubstituted1,2,3-triazoles as well as several triazoles-linked bissaccharides.
Implementing the “Catch-and-Release” Concept into a Simple Method for Regioselective Cyclodextrin Modification
作者:Iris Pflueger、Juan M. Benito
DOI:10.1021/ol400641n
日期:2013.5.17
Differentiation of specific positions in axial-symmetrical cyclodextrins (CDs), exhibiting a dense display of identical functional groups, is challenging. A novel strategy toward this goal that exploits a solid matrix to display the complementary reagent functionalities sufficiently far from each other to prevent CDs from reacting through more than one site is reported. Using a "catch-and-release" process based on the Staudinger reaction, the utility of this concept to easily produce complex CD functionalization patterns in one pot and without any purification step is demonstrated.