title: Catalytic one-pot synthesis of cyclic amidines by virtue of tandem reactions involving intramolecular hydroamination under mild conditions.
abstract: A new synthetic methodology for the generation of cyclic amidines has been developed by the reaction of 1,n-aminoalkynes with electron-deficient azides using a ruthenium catalyst at ambient temperature. The reaction proceeds most likely via a tandem sequence of intramolecular hydroamination of aminoalkynes, cycloaddition of azides with the resulting enamines, and rearrangement of triazoline intermediates. It demonstrates, as the proof-of-principle, that an equilibria cascade sequence can be favorably driven by an irreversible step, thus enabling a facile one-pot synthetic route to deliver molecular complexity under unprecedented mild conditions without relying on the traditional linear approaches.
authors.affiliation: Center for Molecular Design and Synthesis, Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology, Daejeon 305-701, Republic of Korea. sbchang@kaist.ac.kr
authors.forename: Sukbok
authors.initials: S
authors.lastname: Chang
authors.forename: Minjae
authors.initials: M
authors.lastname: Lee
authors.forename: Doo Young
authors.initials: DY
authors.lastname: Jung
authors.forename: Eun Jeong
authors.initials: EJ
authors.lastname: Yoo
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Cho
authors.forename: Sun Kyu
authors.initials: SK
authors.lastname: Han