A Generic Recognition-Based Approach to the Acceleration of Cycloaddition Reactions
作者:Sarah J. Howell、Neil Spencer、Douglas Philp
DOI:10.1021/ol017044c
日期:2002.1.1
GRAPHICSDicarboxylic acids accelerate the rate of cycloaddition reactions between either an azide or a furan and a maleimide through the formation of a reactive 1:1:1 complex stabilized by four hydrogen bonds.
Structure–reactivity relationships in a recognition mediated [3+2] dipolar cycloaddition reaction
作者:Andrew J. Sinclair、Vicente del Amo、Douglas Philp
DOI:10.1039/b908072d
日期:——
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.