An efficient synthesis of polyaza[n]paracyclophanes
作者:Andrea Bencini、M. Isabel Burguete、Enrique Garcia-Espana、Santiago V. Luis、Juan F. Miravet、Conxa Soriano
DOI:10.1021/jo00069a049
日期:1993.8
Supramolecular catalysis of H/D exchange in pyruvate by macrocyclic polyamines involving a reactive iminium intermediate
作者:Hicham Fenniri、Carol Dallaire、Daniel P. Funeriu、Jean-Marie Lehn
DOI:10.1039/a700937b
日期:——
The activity of a series of macrocyclic polyamines as catalysts for proton exchange has been investigated. Structural and physico-chemical studies demonstrate the ability of these receptors to recognize pyruvate, form a covalent iminium intermediate and catalyse H/D exchange at the CH3 position. The reaction follows Michaelis–Menten kinetics with a rate enhancement higher than 4.8 × 105 (kcat/kuncat). The process also represents a potential entry into the catalysis of aldol condensation reactions.