Pyrrolidine derivatives as new inhibitors of alpha-mannosidases and growth inhibitors of human cancer cells
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Readily derived from D-glucose, 5-[(2R,3S,4R)-3,4-dihydroxypyrrolidin-2-yl]-2-methyl-3-furoic esters and amides are selective and competitive inhibitors (K(i)greater than or equal to3 muM) Of alpha -L-fucosidase from bovine epididymis and from human placen ...
The structural features of the active site of human monoamine oxidase B (MAO-B) were investigated by affinity labeling and site-directed mutagenesis. The pseudosubstrate inhibitor N-[2-aminoethyl]-5-chloro-2-pyridine carboxamide HCl (lazabemide) can be irr ...
The preparation of [(2S,3S,4R)-3,4-dihydroxypyrrolidin-2-yl]furan derivatives in a stereoselective route starting from D-glucose and ethyl acetoacetate is presented. Ethyl ester (6), N,N-diethylamide (7) and N-isopropylamide (8) have been tested towards 25 ...
The structure and absolute configuration of natural lentiginosine isolated from plant sources was determined to be (1S,2S,8aS)-1,2-dihydroxyindolizidine ((+)-4) on the basis of the synthesis of both enantiomers (+)-4 and (-)-4 and their inhibition of amylo ...
New 2-(aminomethyl)-5-(hydroxymethyl)pyrrolidine-3,4-diol derivatives were synthesized from (5S)-5-[(trityloxy)methyl]pyrrolidin-2-one (6) (Schemes 1 and 2) and their inhibitory activities toward 25 glycosidases assayed (Table). The influence of the config ...
A simple three-step procedure converted the readily accessible (2-bromo-1,1-difluoroethyl)arenes into a-aryl-a,a-difluoroacetaldehydes. Subsequent hydrocyanation, hydrolysis, oxidn. and again hydrolysis afforded b-aryl-b,b-difluoro-a-oxopropionic acids. Re ...
The cross-aldolization of (-)-(1S,4R,5R,6R)-6-endo-chloro-5-exo-(phenylseleno)-7-oxabicyclo[2.2.1] heptan-2-one ((-)-25) and of(+)-(3aR,4aR,7aR,7bS)- ((+)-26) and(-)-(3aS,4aS,7aS,7bR)-3a,4a,7a,7b-tetrahydro-6,6-dimethyl[1,3]dioxolo [4,5]furo[2,3-d]isoxazol ...
Several 2-(aminomethyl)-and 2-(2-aminoethyl)-pyrrolidine-3,4-diol derivatives have been assayed for their inhibitory activities towards glycosidases. Good inhibitors of alpha-mannosidases must have the (2R,3R,4S) configuration and possess 2-(benzylamino)me ...
Telomerase, a ribonucleoprotein acting as a reverse transcriptase, has been identified as a target for cancer drug discovery. The synthetic, non-nucleosidic compound, BIBR1532, is a potent and selective telomerase inhibitor capable of inducing senescence i ...
A number of cyclo-β-tripeptides and their linear precursors were subjected to primary biol. evaluation for cancer-cell growth inhibition (one-dose, three-cell essay), and the five most active ones were then tested in the anti-tumor screen of the National C ...
