名称:
Regioselective synthesis of 1,7-diprotected 1,4,7,10-tetraazacyclododecane and preparation of a dialcohol dicarboxylic macrocyclic ligand
摘要:
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 starting materials, for instance for the preparation of 4,10-bis(2'-hydroxyethyl)-1,7-bis(carboxymethyl)-1,4,7,10-tetraazacyclododecane.