DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Mechanistic studies of a “Declick” reaction

Journal Article · · Chemical Science
DOI: https://doi.org/10.1039/c9sc00690g · OSTI ID:1624973
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [5]; ORCiD logo [4]
  1. Mercer Univ., Macon, GA (United States). Dept. of Chemistry; DOE/OSTI
  2. Xi'an Jiaotong Univ., Shaanxi (China). The Key Lab. of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Photovoltaics & Materials Technology Dept.
  4. Univ. of Texas, Austin, TX (United States). Dept. of Chemistry
  5. Univ. of Texas, Austin, TX (United States). Dept. of Molecular Biosciences, Inst. for Cellular and Molecular Biology

A kinetic analysis of a “declick” reaction is described. Compound 1, previously reported to couple an amine and a thiol (i.e. “click”) under mild aqueous conditions to create 2, undergoes release of the unaltered coupling partners upon triggering with dithiothreitol (DTT). In the study reported herein various aniline derivatives possessing para-electron donating and withdrawing groups were used as the amines. UV/vis spectroscopy of the declick reaction shows time-dependent spectra lacking isosbestic points, implying a multi-step mechanism. Global data fitting using numerical integration of rate equations and singular value decomposition afforded the spectra and time-dependence of each species, as well as rate constants for each step. The kinetic analysis reveals a multi-step process with an intermediate where both thiols of DTT have added prior to expulsion of the aniline leaving group, followed by rearrangement to the final product. Hammett plots show a negative rho value on two of the steps, indicating positive charge building (i.e. reduction of a negative charge) in the step leading to the intermediate and its ratedetermining breakdown. Overall, the kinetic study reported herein gives a complete mechanistic picture of the declick reaction.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC); Welch Foundation; Welch Regents Chair
Grant/Contract Number:
NA0003525
OSTI ID:
1624973
Journal Information:
Chemical Science, Journal Name: Chemical Science Journal Issue: 38 Vol. 10; ISSN 2041-6520; ISSN CSHCBM
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (16)

An Auto‐Inductive Cascade for the Optical Sensing of Thiols in Aqueous Media: Application in the Detection of a VX Nerve Agent Mimic journal July 2017
An Auto-Inductive Cascade for the Optical Sensing of Thiols in Aqueous Media: Application in the Detection of a VX Nerve Agent Mimic journal July 2017
Singular value decomposition and least squares solutions journal April 1970
[8] Singular value decomposition: Application to analysis of experimental data book January 1992
Deconvolutions based on singular value decomposition and the pseudoinverse: a guide for beginners journal January 1994
Global Kinetic Explorer: A new computer program for dynamic simulation and fitting of kinetic data journal April 2009
FitSpace Explorer: An algorithm to evaluate multidimensional parameter space in fitting kinetic data journal April 2009
A tetrahedral intermediate in the EPSP synthase reaction observed by rapid quench kinetics journal September 1988
Kinetic and structural analysis of enzyme intermediates: lessons from EPSP synthase journal November 1990
Substituent effects on dissociation of benzoic acids and heteroconjugation of benzoates with p-bromophenol in acetonitrile, N,N-dimethylformamide, and dimethyl sulfoxide. Intramolecular hydrogen bonding in o-hydroxybenzoic acids and their anions journal August 1971
Stopped-Flow Kinetic Analysis of the Interaction of Cyclo[8]pyrrole with Anions journal November 2010
Click and chemically triggered declick reactions through reversible amine and thiol coupling via a conjugate acceptor journal September 2016
Singular value decomposition for genome-wide expression data processing and modeling journal August 2000
Missing value estimation methods for DNA microarrays journal June 2001
The singular value decomposition: Its computation and some applications journal April 1980
A Multilinear Singular Value Decomposition journal January 2000