Regioselective synthesis of 1,7-diprotected 1,4,7,10-tetraazacyclododecane and preparation of a dialcohol dicarboxylic macrocyclic ligand

Article abstract of DOI:10.1016/S0040-4039(00)73077-2

The reaction of 1,4,7,10-tetraazacyclododecane with p-toluenesulfonyl chloride in pyridine or with diethyl phosphite and CCl4 in a water/CH2Cl2 mixture yields selectively the 1,7-diprotected regioisomer.The 1,7-diprotected tetraaza cycles are interesting