Synthesis of <i>C</i>-Propargylic Esters of N-Protected Amino Acids and Peptides
作者:Sean P. Bew、Glyn D. Hiatt-Gipson
DOI:10.1021/jo100537q
日期:2010.6.4
critical importance of aminoacids in organic synthesis as well as their myriad of applications in “click” chemistry it is interesting to note that the synthesis of C-propargyl derived aminoacidesters has not been particularly well served. We report a convenient, straightforward, and high-yielding synthesis of structurally diverse C-propargyl-derived N-protected aminoacidesters.
A mild and efficient method for the preparation of n-tosyl amides and lactams
作者:David Tanner、Peter Somfai
DOI:10.1016/s0040-4020(01)85848-8
日期:1988.1
N-tosyl amides and lactams can be prepared easily and under mild conditions by the inter- or intramolecular condensation of carboxylic acids and secondary sulfonamides. The coupling reagent used is dicyclohexyl-carbodiimide (DCC) in the presence of 4-pyrrolidinopyridine (4-PPY) and the reactions proceed readily, usually in high yield, at room temperature.
Synthesis of novel 6-amido-6-deoxy-l-galactose derivatives as sialyl Lewis X mimetics
作者:Michael W. Cappi、Wilna J. Moree、Lei Qiao、Thomas G. Marron、Gabriele Weitz-Schmidt、Chi-Huey Wong
DOI:10.1016/s0968-0896(96)00236-2
日期:1997.2
The synthesis and biological potency of several sialylLewisX (SLe(x)) mimetics is described. These mimics incorporate all of the critical functional groups present in SLe(x) necessary for binding to E-selectin. L-Galactose is used to mimic the naturally occurring L-fucose residue in SLe(x) due to the identical arrangement of the 2-, 3-, and 4-hydroxyl groups. Several synthetically and enzymatically
Replacement of Glycine with Dicarbonyl and Related Moieties in Analogues of the C-Terminal Pentapeptide of Cholecystokinin: CCK<sub>2</sub> Agonists Displaying a Novel Binding Mode
known to possess sufficient structural features for CCK(2) recognition, none shares the properties of BC 264. Hence we have developed new short peptidic or pseudo-peptidic derivatives containing the C-terminal tetrapeptide of BC 264. Our results indicate that some compounds characterized by the presence of two carbonyl groups at the N-terminus, as in 2b (HO(2)C-CH(2)-CONH-Trp-(NMe)Nle-Asp-Phe-NH(2)), are
Provided are novel compounds represented by the following general formula [1] or pharmaceutically acceptable salts thereof, that inhibit LpxC, as well as pharmaceutical drugs comprising those compounds or pharmaceutically acceptable salts thereof, that exhibit antimicrobial activity against gram-negative bacteria including Pseudomonas aeruginosa and their drug resistant strains and are useful in the treatment of bacterial infections, wherein X is selected from the following formula [2] : Y is selected from the following formula [3].