Journal of the American Chemical Society, Vol.139, No.25, 8455-8457, 2017
[2]Rotaxane Formation by Transition State Stabilization
We report on the synthesis of [2]rotaxanes driven by stabilization of the axle-forming transition state. A bifunctional macrocycle, with hydrogen bond donors at one end and acceptors at the other, is used to stabilize the charges that develop during the addition of a primary amine to a cyclic sulfate.