Recent development in peptide coupling reagents

New trends in peptide coupling reagents

2‐chloro‐4,6‐disubstituted‐1,3,5‐triazines. a novel group of condensing reagents

The synthesis, properties, and application of condensing reagents derived from 1,3,5-triazines are described. The mechanism of activation of carboxylic function, structure of reactive intermediates, and mechanism of acylation of nucleophiles are presented. The synthetic versatility of mono- and bifunctional reagents for syntheses in solution, triazine-based immobilized reagents, chiral triazines for enantiodifferentiating syntheses, are discussed. The scope and limitation of the synthetic utility of triazine reagents in the preparation of heterocyclic compounds, amides, esters, oligopeptides-including large-scale syntheses and use in the combinatorial chemistry-is demonstrated.

Triazine-based condensing reagents

Publisher Summary This chapter provides a summary of the methods developed for the synthesis of L-ascorbic acid. L -Ascorbic acid is a white, crystalline solid melting at 192°C and having, in water, a specific rotation at the sodium D line of +24°. In solution, L -ascorbic acid has a pK 1 of 4.17 and a pK 2 of 11.79. The more-acidic proton has been shown by both chemical and physical methods to be that of the 3-hydroxyl group. The structure of L-ascorbic acid in solution has been studied by C-NMR spectroscopy, suggesting that a variety of tautomeric structures is possible. L-Ascorbic acid has also been synthesized from D-galacturonic acid —a hexose derivative not as readily available as D-glucose. In the chapter, the methods of preparation of precursors in the various syntheses are discussed. Many of the methods used for the preparation of analogs are based on the procedures used for the synthesis of L -ascorbic acid. The synthesis and biological activity of a number of these analogs are reviewed in the chapter.

Synthesis of L-Ascorbic Acid

Cyanuric Chloride Derivatives. III. Alkoxy-s-triazines

Lead Tetraacetate Oxidations in the Sugar Group. X.1 Crystalline 2,4,3,5-Diethylidene-aldehydo-L-xylose and Several of its Derivatives2

Cyanuric Chloride Derivatives. VII. Transesterification Reactions of Alkoxy-s-triazines. Polyammelide Ethers

Cyanuric Chloride Derivatives. VIII. Vinylamino-s-triazines

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Cyanuric Chloride Derivatives. III. Alkoxy-s-triazines

Lead Tetraacetate Oxidations in the Sugar Group. X.1 Crystalline 2,4,3,5-Diethylidene-aldehydo-L-xylose and Several of its Derivatives2

Cyanuric Chloride Derivatives. VII. Transesterification Reactions of Alkoxy-s-triazines. Polyammelide Ethers

Cyanuric Chloride Derivatives. VIII. Vinylamino-s-triazines