Multipurpose isothiocyanyl alanine/lysine: Use as solvatochromic IR probes and in site specific labeling/ligation of short peptides
摘要:
The solvatochromic IR responsivity of small side chain-NCS in two unexplored unnatural amino acids, isothiocyanyl alanine ((NCS)Ala = Ita) and lysine ((NCS)Lys = Itl), without perturbing the conformation is demonstrated in two designed short tripeptide (BocAla-(NCS)Ala-Ala-OMe) and hexapeptide (BocLeu-ValPhe- Phe-(NCS)Lys-Gly-OMe). Demonstration of site specific fluorescent labeling in both the peptides and ligation type reaction in (NCS)Lys indicates the novelty of these two amino acids as alternative to the available canonical amino acids. (C) 2018 Published by Elsevier Ltd.
Intramolecular cyclization of isothiocyanyl amino acids/peptide: arrival at unnatural thioxoimidazolidinyl/thioxooxazolidinyl amino acids
作者:Subhendu Sekhar Bag、Suranjan De、Shilpa Bhuyan
DOI:10.1007/s00726-022-03186-w
日期:2022.11
A novel intramolecular cyclization of isothiocyanyl aminoacids/peptide is reported to arrive at unnatural thioxoimidazolidinyl (TOI)/thioxooxazolidinyl (TOO) aminoacids for the first time. Interestingly, analogous isothiocyanyl amines under a similar reaction condition either follow 5-endo-dig cyclization to offer 5-membered thiourea or acyclic diethylaminyl thiourea derivative instead of 6-membered
Potent and selective bicyclic lactam inhibitors of thrombin: Part 3: P1′ modifications
作者:Janet S. Plummer、Kent A. Berryman、Cuiman Cai、Wayne L. Cody、John DiMaio、Annette M. Doherty、Scott Eaton、Jeremy J. Edmunds、Debra R. Holland、D. Lafleur、Sophie Levesque、Lakshmi S. Narasimhan、J.Ronald Rubin、Stephen T. Rapundalo、M.Arshad Siddiqui、A. Susser、Yves St-Denis、Peter Winocour
DOI:10.1016/s0960-894x(99)00096-7
日期:1999.3
The synthesis and antithrombotic activity of a series of nonpeptide bicyclic thrombin inhibitors are described. We have explored the SAR around the P1' site. Modification of the P1' site has been found to affect potency and selectivity. (C) 1999 Elsevier Science Ltd. All rights reserved.
Multipurpose isothiocyanyl alanine/lysine: Use as solvatochromic IR probes and in site specific labeling/ligation of short peptides
作者:Subhendu Sekhar Bag、Suranjan De
DOI:10.1016/j.bmcl.2018.02.021
日期:2018.5
The solvatochromic IR responsivity of small side chain-NCS in two unexplored unnatural amino acids, isothiocyanyl alanine ((NCS)Ala = Ita) and lysine ((NCS)Lys = Itl), without perturbing the conformation is demonstrated in two designed short tripeptide (BocAla-(NCS)Ala-Ala-OMe) and hexapeptide (BocLeu-ValPhe- Phe-(NCS)Lys-Gly-OMe). Demonstration of site specific fluorescent labeling in both the peptides and ligation type reaction in (NCS)Lys indicates the novelty of these two amino acids as alternative to the available canonical amino acids. (C) 2018 Published by Elsevier Ltd.