Synthesis of stereoisomeric crown ethers composed of cis- and trans-2,5-bis(hydroxymethyl)tetrahydrofuran units and their selective transport of alkali metal cations through liquid membranes
Synthesis of stereoisomeric crown ethers composed of cis- and trans-2,5-bis(hydroxymethyl)tetrahydrofuran units and their selective transport of alkali metal cations through liquid membranes
Synthesis and Conformational Studies of Peptidomimetics Containing Furanoid Sugar Amino Acids and a Sugar Diacid
作者:T. K. Chakraborty、S. Ghosh、S. Jayaprakash、J. A. R. P. Sharma、V. Ravikanth、P. V. Diwan、R. Nagaraj、A. C. Kunwar
DOI:10.1021/jo000408e
日期:2000.10.1
Incorporation of these furanoid sugar amino acids into Leu-enkephalin replacing its Gly-Gly portion gave analogues 8-11. Detailed structural analysis of these molecules by circular dichroism (CD) and various NMR techniques in combination with constrained molecular dynamics (MD) simulations revealed that two of these analogues, 8a and 10a, have folded conformations composed of an unusual nine-membered pseudo
[EN] HYDROGENATION OF A COMPOSITION COMPRISING HYDROXYMETHYLFURFURAL, BISHYDROXYMETHYLFURAN OR MIXTURES THEREOF<br/>[FR] HYDROGÉNATION D'UNE COMPOSITION COMPRENANT DE L'HYDROXYMÉTHYLFURFURAL, DU BISHYDROXYMÉTHYLFURANE OU DES MÉLANGES DE CEUX-CI
申请人:BASF SE
公开号:WO2018087270A1
公开(公告)日:2018-05-17
The invention relates to a process for the hydrogenation of a composition comprising hydroxymethylfurfural, bishydroxymethylfuran or mixtures thereof to obtain a composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanol and trans-(tetrahydrofuran-2,5-diyl)dimethanol. The invention also relates to a composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanol and trans-(tetrahydrofuran-2,5-diyl)dimethanol. Further, the invention also relates to a use of transition metal complex as hydrogenation catalyst for composition comprising hydroxymethylfurfural, bishydroxymethylfuran or mixtures thereof. The invention also relates to a use of the composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanol and trans-(tetrahydrofuran-2,5-diyl)dimethanol for polymerization reactions.
[EN] HYDROGENATION OF SUBSTITUTED FURANS CATALYZED BY NHC-CONTAINING LIGANDS<br/>[FR] HYDROGÉNATION DE FURANES SUBSTITUÉS CATALYSÉS PAR DES LIGANDS CONTENANT DU NHC
申请人:BASF SE
公开号:WO2018220003A1
公开(公告)日:2018-12-06
The present invention relates to a process for the hydrogenation of a composition comprising hydroxymethylfurfural, bishydroxymethylfuran or mixtures thereof to obtain a composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanoland trans-(tetrahydrofuran-2,5-diyl)dimethanol. The invention also relates to a composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanol and trans-(tetrahydrofuran-2,5-diyl)dimethanol. Further, the invention also relates to a use of transition metal complex as hydrogenation catalyst for composition comprising hydroxymethylfurfural, bishydroxymethylfuran or mixtures thereof. The invention also relates to a use of the composition comprising cis-(tetrahydrofuran-2,5-diyl)dimethanol and trans-(tetrahydrofuran-2,5-diyl)dimethanol for polymerization reactions.
Studies toward a Library of Tetrahydrofurans: Click and MCR Products of Mono- And Bis-Tetrahydrofurans
作者:Jitendra K. Mishra、Peter Wipf、Subhash C. Sinha
DOI:10.1021/cc1000709
日期:2010.9.13
Mono- and bis-tetrahydrofuran-based chemical libraries with diverse structural features have been prepared using the Sharpless azide-alkyne Click reaction and multi-component reactions (MCRs) such as Ugi and Biginelli reactions. Mono- and bis-tetrahydrofuran methyl azides, amines and ureas were key intermediates in these processes, and they were synthesized from the corresponding tetrahydrofuran methyl alcohols by mesylation followed by substitution with azide, reduction of the azide to the amine, and urea formation, as needed. Most mono- and tetrahydrofuran methyl alcohols were obtained by a Sharpless asymmetric dihydroxylation reaction. Alternatively, several mono-tetrahydrofurans were prepared by a cobalt(II) complex-catalyzed oxidative cyclization of bis-homoallylic alcohols, which were obtained by copper(I) iodide-catalyzed epoxide opening of 5,6-epoxyhex-1-ene with various alkyl and aryl Grignard reagents. These compounds are examples of an entirely new class of molecules in hitherto unknown chemical space, though their functions are yet to be determined presumably through random screening.