Probing the mechanism and dynamic reversibility of trianglimine formation using real-time electrospray ionization time-of-flight mass spectrometry
作者:Hany F. Nour、Ana M. Lopez-Periago、Nikolai Kuhnert
DOI:10.1002/rcm.6203
日期:2012.5.15
The [3+3]‐cyclocondensation reactions of chiral (1R,2R)‐1,2‐diaminocyclohexane with aromatic or aliphatic bis‐aldehydes to form trianglimine macrocycles were reported a decade ago and were believed to proceed through a stepwise mechanistic pathway; however, no intermediates were ever isolated or detected and characterized.
Synthesis of tri-substituted biaryl based trianglimines: formation of C3-symmetrical and non-symmetrical regioisomers
作者:Hany F. Nour、Marius F. Matei、Bassem S. Bassil、Ulrich Kortz、Nikolai Kuhnert
DOI:10.1039/c0ob00944j
日期:——
2-Functionalised aromatic monoaldehydes were synthesised in good to excellent yields by reacting 4-bromo-2-fluorobenzaldehyde with different secondary amines and phenol. The Suzuki-coupling reaction of the newly functionalised aromatic monoaldehydes with 4-formylphenylboronic acid afforded the corresponding 2-functionalised-4,4′-biphenyldialdehydes in good yields (47–85%). The [3+3]-cyclocondensation reactions of the 2-functionalised-4,4′-biphenyldialdehydes with (1R,2R)-1,2-diaminocyclohexane afforded a mixture of regioisomeric C3-symmetrical and non-symmetrical trianglimines. Reduction of the C3-symmetrical and the non-symmetrical trianglimines with NaBH4 in a mixture of THF and MeOH afforded the corresponding trianglamines in high yields.