title: A simple, regioselective synthesis of 1,4-bis(tert-butoxycarbonylmethyl)- tetraazacyclododecane.
abstract: A convenient synthetic route to 1,4-bis(tert-butoxycarbonylmethyl)tetraazacyclododecane (cyclen) (1) with high yield and excellent regioselectivity is described. Compound 1 reacted with a range of functionalized alkyl halides under two reaction conditions to give mono-N-alkylated 1,4-bis(tert-butoxycarbonylmethyl)tetraazacyclododecane (2-9) in good yield.
authors.affiliation: Department of Chemistry and Open Laboratory of Chemical Biology of the Institute of Molecular Technology for Drug Discovery and Synthesis, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China.
authors.forename: Cong
authors.initials: C
authors.lastname: Li
authors.forename: Wing-Tak
authors.initials: WT
authors.lastname: Wong