HMDO-Promoted Peptide and Protein Synthesis in Ionic Liquids
摘要:
Hexamethyldisiloxane (HMDO) has been developed to efficiently promote the metal-free direct coupling of an amino function of one cysteine-free peptide or protein and a C-terminal thioester of the second peptide in ionic liquids. The amide-coupling reaction proceeds smoothly under mild conditions to afford the corresponding products in good to excellent yields (63-94%). Peptide couplings were also achieved using in-situ-generated thioesters by the thioesterification of oxo esters.
Metal-free direct amidation of peptidyl thiol esters with α-aminoacid esters in the presence of bis(trimethylsilyl) acetamide (BSA) has been developed. This general method provides convenient access to N-protected peptides in good yields under mild conditions and demonstrates a high tolerance to functionality.
Phosphorus pentoxide for amide and peptide bond formation with minimal by-products
作者:Venkataramana Erapalapati、Umatai A. Hale、Nandita Madhavan
DOI:10.1016/j.tetlet.2019.151311
日期:2019.12
Phosphoruspentoxide and DMAP are used for amide bond formation from carboxylic acids and amines. Dipeptides and amides have been synthesized using this reagent in 42-77% yields and >99% ees. The protocol is attractive as it occurs at ambient temperature, the formation of organic by-products is minimal and the reagent can be readily quenched using water. Furthermore, excellent enantioselectivities
Papain catalysed peptide synthesis: control of amidase activity and the introduction of unusual amino acids
作者:Carlos F. Barbas、Chi-Huey Wong
DOI:10.1039/c39870000533
日期:——
Procedures for the papaincatalysedsynthesis of peptides containing D-amino acids and derivatives with control of the enzyme's amidaseactivity have been developed.