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Beilstein J. Org. Chem. 2025, 21, 1462–1476, doi:10.3762/bjoc.21.108
Graphical Abstract
Scheme 1: Representative synthetic routes for the C–H amination of benzoxazole using supported copper catalys...
Figure 1: Reaction of benzimidazole with piperidine. a) Reaction scheme including intermaidates and b) conver...
Figure 2: Reaction rate comparison between conventional (oil bath) and MW heating. Reaction conditions: benzo...
Scheme 2: Graphical representation of Si-MonoAm-Cu(I) and Si-DiAm-Cu(I) preparation.
Figure 3: TGA profiles of SIPERNAT silica and Si-MonoAm and Si-DiAm.
Scheme 3: Scope of the MW-promoted C2-amination of benzoxazole catalysed by Si-MonoAm-Cu(I). Reaction conditi...
Scheme 4: C2-Amination of substituted benzoxazoles. Reaction conditions: benzoxazole (1.0 mmol), piperidine (...
Figure 4: Hot filtration test for the Si-MonoAm-Cu(I)-catalysed C2-amination of benzoxazole with piperidine i...
Figure 5: FTIR spectra of samples on the left 3800–2400 cm−1 wavenumber on the right 1750–1350 cm−1 wavenumbe...
Figure 6: Si-MonoAm-Cu(I) catalyst reuse.
Figure 7: FESEM images of sample a) Si-MonoAm-Cu(I) 5 wt % and c) Si-MonoAm-Cu(I) 5 wt % used.
Figure 8: EDS maps of a) Si-MonoAm-Cu(I) and b) Si-MonoAm-Cu(I) used.