Palladium-catalyzed amination was successfully applied to the synthesis of macrobicyclic cryptands comprising cyclen or cyclam and pyridine moieties. Starting bis(halopyridylmethyl) substituted cyclen and cyclam were obtained from protected tetraazamacrocycles in good yields and introduced in the catalytic macrocyclization reactions with a number of polyamines and oxadiamines to give target macrobicycles. The yields of macrobicyclic cryptands were shown to be dependent on the cavity size of starting tetraazamacrocycle, on the nature of halogen atom and substitution pattern in the starting compounds, and on the nature of di- and polyamines. The best yields reached 33%.
Palladium-Catalyzed Amination in the Synthesis of Macrobicycles Incorporating Cyclen, Cyclam and Pyridine Moieties
作者:Irina P. Beletskaya、Alexei D. Averin、Kanat S. Tyutenov、Anton V. Shukhaev、Sergei M. Kobelev、Alexei K. Buryak、Franck Denat、Roger Guilard
DOI:10.3987/com-12-s(n)88
日期:——
Palladium-catalyzed amination was successfully applied to the synthesis of macrobicyclic cryptands comprising cyclen or cyclam and pyridine moieties. Starting bis(halopyridylmethyl) substituted cyclen and cyclam were obtained from protected tetraazamacrocycles in good yields and introduced in the catalytic macrocyclization reactions with a number of polyamines and oxadiamines to give target macrobicycles. The yields of macrobicyclic cryptands were shown to be dependent on the cavity size of starting tetraazamacrocycle, on the nature of halogen atom and substitution pattern in the starting compounds, and on the nature of di- and polyamines. The best yields reached 33%.