Facile Amide Bond Formation From Esters of Amino Acids and Peptides Catalyzed by Alkaline Protease in Anhydrous<i>tert</i>-Butyl Alcohol Using Ammonium Chloride/Triethylamine as a Source of Nucleophilic Ammonia
作者:Shui-Tein Chen、Ming-Kuei Jang、Kung-Tsung Wang
DOI:10.1055/s-1993-25955
日期:——
An industrial alkaline protease "Alcalase", stable and active in tert-butyl alcohol, was used to catalyze the synthesis of N-protected amino acids or peptide amides in anhydrous tert-butyl alcohol using ammonium chloride/triethylamine as source of nucleophilic ammonia
carbamoylmethyl (Cam) esters as acyldonors in the presence of a cysteine protease, papain, immobilized on Celite. Several segment condensations were also achieved generally in high yields without danger of racemization and formation of the secondary-hydrolysis product. Moreover, partial sequences of some bioactive peptides were prepared through segment condensations, and aimed-at peptides were obtained generally
Peptide synthesis mediated by immobilized and viable baker's yeast in reverse micelles: synthesis of leucine enkephalin analogues
作者:N. W. Fadnavis、A. Deshpande、S. Chauhan、U. T. Bhalerao
DOI:10.1039/c39900001548
日期:——
Cells of baker'syeast (Saccharomyces cerevisiaeNCIM 3305) immobilized in calcium alginate beads are found to be viable in reversemicelles of bis(2-ethylhexyl)sulphosuccinate sodium salt 1 in iso-octane for days and were used for the first time for peptidesynthesis (in aerosol OT reversemicelles) using hydrophobic substrates.
Chymotrypsin suspended in organic solvents with salt hydrates is a good catalyst for peptide synthesis from mainly undissolved reactants
作者:Peter Kuhl、Peter J. Halling、Hans-Dieter Jakubke
DOI:10.1016/s0040-4039(00)97845-6
日期:1990.1
Chymotrypsin powder suspended in organicsolvents in the presence of Na2CO3.10H2O catalyses peptidesynthesis from X-Ala-Phe-OMe and Leu-NH2 (X = Boc or Z). The reaction proceeds best in the most non-polar solvents, such as hexane, despite the fact that both reactants and products remain largely undissolved. Leu-NH2.HCl can be used in place of the free base.