title: Structure-reactivity relationships in a recognition mediated [3+2] dipolar cycloaddition reaction.
abstract: The [3+2] dipolar cycloaddition between an azide and maleimide can be accelerated by a factor of more than 100 simply by attaching complementary recognition sites to the reactive partners. This rate acceleration derives from the formation of a reactive binary complex between the azide and the maleimide. The variation of the observed rate acceleration with simple structural changes, such as adding additional rotors, should be relatively predictable. However, the application of a simple, rotor-based increment in the systems reported here is insufficient to predict reactivity correctly. Computational studies suggest that the nature of the available reaction pathways within the binary complex formed by the reactants is important in determining the reactivity of a given complex.
authors.affiliation: Centre for Biomolecular Sciences, School of Chemistry, University of St Andrews, North Haugh, St Andrews, United KingdomKY16 9ST.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Sinclair
authors.forename: Vicente
authors.initials: V
authors.lastname: del Amo
authors.forename: Douglas
authors.initials: D
authors.lastname: Philp
mesh_terms: D001386:Azides / Q000737:chemistry; D002384:Catalysis; D002800:Cholinesterase Inhibitors / Q000302:isolation & purification*; D003500:Cyclization; D019281:Dimerization; D019020:Directed Molecular Evolution; D004791:Enzyme Inhibitors / Q000302:isolation & purification; D007147:Immunoglobulin Light Chains / Q000737:chemistry*; D007135:Immunoglobulin Variable Region / Q000737:chemistry; D008301:Maleimides / Q000737:chemistry / Q000494:pharmacology; D015202:Protein Engineering; D013329:Structure-Activity Relationship; D013379:Substrate Specificity
chemical_list: D001386:Azides; D002800:Cholinesterase Inhibitors; D004791:Enzyme Inhibitors; D007147:Immunoglobulin Light Chains; D007135:Immunoglobulin Variable Region; D008301:Maleimides; C043592:maleimide