609-41-6Relevant articles and documents
Azabicyclic vinyl sulfones for residue-specific dual protein labelling
Gil De Montes, Enrique,Jiménez-Moreno, Ester,Oliveira, Bruno L.,Navo, Claudio D.,Cal, Pedro M. S. D.,Jiménez-Osés, Gonzalo,Robina, Inmaculada,Moreno-Vargas, Antonio J.,Bernardes, Gon?alo J. L.
, p. 4515 - 4522 (2019/04/29)
We have developed [2.2.1]azabicyclic vinyl sulfone reagents that simultaneously enable cysteine-selective protein modification and introduce a handle for further bioorthogonal ligation. The reaction is fast and selective for cysteine relative to other amino acids that have nucleophilic side-chains, and the formed products are stable in human plasma and are moderately resistant to retro Diels-Alder degradation reactions. A model biotinylated [2.2.1]azabicyclic vinyl sulfone reagent was shown to efficiently label two cysteine-tagged proteins, ubiquitin and C2Am, under mild conditions (1-5 equiv. of reagent in NaPi pH 7.0, room temperature, 30 min). The resulting thioether-linked conjugates were stable and retained the native activity of the proteins. Finally, the dienophile present in the azabicyclic moiety on a functionalised C2Am protein could be fluorescently labelled through an inverse electron demand Diels-Alder reaction in cells to allow selective apoptosis imaging. The combined advantages of directness, site-specificity and easy preparation mean [2.2.1]azabicyclic vinyl sulfones can be used for residue-specific dual protein labelling/construction strategies with minimal perturbation of native function based simply on the attachment of an [2.2.1]azabicyclic moiety to cysteine.
Reactions at high pressure. Part 15. Rates, activation parameters, and a volume profile for retro-Diels-Alder reactions in the pyrrole series
George, Adrian V.,Isaacs, Neil S.
, p. 1845 - 1848 (2007/10/02)
Thermal decomposition of N-acylpyrrole adducts of N-phenylmaleimide by a ?2s + ?2s = ?2s> route occurs at temperature below 70 deg C.Rates and activation parameters for the termolyses of endo- and exo-10-benzoyl-4-phenyl-4,10-diazatricyclo2,6>dec-8-ene-3,5-dione (6) and (7), exo-10-acetyl-4-phenyl-4,10-diazatricyclo2,6>dec-8-ene-3,5-dione (8), and endo-4-phenyl-4-aza-10-oxatricyclodec-8-ene-3,5-dione (9) have been measured at various temperatures and pressures and in various solvents.It is confirmed that the volume of activation for thermolysis of (6) is negative, consistent with a transition state more compact than either reagents or products and not accountable for in terms of dipolar character.