title: Regioselective N-substitution of cyclen with two different alkyl groups: synthesis of all possible isomers.
abstract: All possible configurations of two different groups on the four nitrogen atoms of cyclen were achieved using four differently protected cyclen intermediates including the novel mono-protected cyclen compound, mono-N-Cbz-cyclen.
authors.affiliation: Mallinckrodt Institute of Radiology, Washington University School of Medicine, 510 South Kingshighway Boulevard, St. Louis, MO 63110, USA.
authors.forename: Jeongsoo
authors.initials: J
authors.lastname: Yoo
authors.forename: David E
authors.initials: DE
authors.lastname: Reichert
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Welch