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.
通过 4-溴-2-氟苯甲醛与不同的仲胺和苯酚反应,合成了 2-官能化的芳香族一醛,收率从良好到极佳。新官能化的芳香族一醛与 4-甲酰基苯硼酸发生铃木偶联反应,得到相应的 2-官能化-4,4′-联苯二醛,收率良好(47-85%)。2-官能化-4,4′-联苯二醛与(1R,2R)-1,2-二氨基环己烷的[3+3]-环缩合反应生成了 C3-对称和非对称三醯亚胺异构体混合物。在 THF 和 MeOH 的混合物中用 NaBH4 还原 C3 对称和非对称三醯亚胺,可以高产率得到相应的三醯胺。