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2 article(s) from Janiak, Christoph

Emission solvatochromic, solid-state and aggregation-induced emissive α-pyrones and emission-tuneable 1H-pyridines by Michael addition–cyclocondensation sequences

Natascha Breuer,
Irina Gruber,
Christoph Janiak and
Thomas J. J. Müller

Beilstein J. Org. Chem. 2019, 15, 2684–2703, doi:10.3762/bjoc.15.262

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Scheme 1: Consecutive three-component alkynylation–Michael addition–cyclocondensation (AMAC) synthesis of α-p...

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Scheme 2: Consecutive pseudo-four-component alkynylation–Michael addition–cyclocondensation (AMAC) synthesis ...

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Scheme 3: Consecutive pseudo-four-component alkynylation–Michael addition–cyclocondensation (AMAC) synthesis ...

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Scheme 4: Model system for the optimization of the Michael addition–cyclocondensation reaction step to 1H-pyr...

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Scheme 5: Formation of α-pyrone 6a and 1H-pyridine 5a at 20 °C.

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Scheme 6: Formation of α-pyrone 6a starting from alkynone 3b having an electron-donating substituent.

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Scheme 7: Formation of 1H-pyridine 5b starting from alkynone 3d having an electron-withdrawing substituent.

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Scheme 8: Formation of 1H-pyridine 8a by Michael addition–cyclocondensation reaction.

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Scheme 9: Mechanistic rationale for the formation of the 1H-pyridine 5a.

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Scheme 10: Formation of 1H-pyridine 8a from alkynone 3b and dimer 7.

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Figure 1: Molecular structure of 1H-pyridine 5a (50% thermal ellipsoids), showing the intramolecular N–H···O ...

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Figure 2: Supramolecular C–H···N [36-39] and C–H···π [40-49] interactions around the 6-positioned phenyl ring in 5a. Detail...

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Figure 3: 1H-Pyridine derivatives 5 as solids under daylight (top), under UV light (λ_exc = 365 nm, c(5) = 10⁻⁴...

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Figure 4: Selected normalized absorption (solid lines) and emission (dashed lines) spectra of 1H-pyridines 5a...

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Figure 5: Selected normalized emission spectra of 1H-pyridine 5a and 5b in the solid state at T = 298 K.

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Figure 6: Selected normalized absorption (solid lines) and emission (dashed lines) spectra of 1H-pyridines 8a...

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Figure 7: Solid-state luminescence of 1H-pyridines 5a, 8a and 8b (λ_exc = 365 nm).

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Figure 8: α-Pyrones 6 as solids under daylight (top), selected derivatives under UV light (λ_exc = 365 nm, c(6...

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Figure 9: Selected normalized absorption spectra of α-pyrones 6a, 6b, 6d, and 6e recorded in dichloromethane ...

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Figure 10: Selected normalized absorption (solid lines) and emission (dashed lines) spectra of α-pyrones 6c, 6e...

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Figure 11: Absorption (top) and fluorescence (bottom) of compound 6c with variable solvent polarity (left to t...

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Figure 12: Absorption (solid lines) and emission (dashed lines) spectra of α-pyrone 6c in five solvents of dif...

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Figure 13: Lippert plot for α-pyrone 6c (n = x, r² = 0.970).

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Figure 14: Normalized emission spectra of selected α-pyrones 6a–d,f in the solid state at T = 298 K.

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Figure 15: Fluorescence of compound 6e in different THF/water fractions (top, λ_exc = 365 nm, handheld UV lamp)...

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Figure 16: Selected DFT-computed (B3LYP 6-311G**) Kohn–Sham FMOs for 1H-pyridines 5f and 5g representing contr...

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Figure 17: Selected DFT-computed (B3LYP 6-311G**) Kohn–Sham FMOs for 1H-pyridines 6a, 6c, 6e, 6f, and 6g and r...

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Published 12 Nov 2019

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The Ugi four-component reaction as a concise modular synthetic tool for photo-induced electron transfer donor-anthraquinone dyads

Sarah Bay,
Gamall Makhloufi,
Christoph Janiak and
Thomas J. J. Müller

Beilstein J. Org. Chem. 2014, 10, 1006–1016, doi:10.3762/bjoc.10.100

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Figure 1: Phenothiazine–anthraquinone dyad 1, donor-only (2) and acceptor-only (3) models assembled by Ugi 4C...

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Scheme 1: Ugi 4CR synthesis of donor–anthraquinone dyads 8.

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Scheme 2: Ugi 4CR synthesis of donor-only reference systems 10.

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Figure 2: Molecular structure of S(O)-1 (left) (30% ellipsoids, except for the CH₃CH₂ end of the hexyl group,...

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Figure 3: Cyclic voltammogram of dyad 8c (recorded in CH₂Cl₂, T = 298 K, c (8c) = 0.1 mol·L⁻¹, Pt working ele...

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Figure 4: DFT-computed (B3LYP, 6-311G*) frontier molecular orbitals HOMO (bottom) and LUMO (top) of the pheno...

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Figure 5: Normalized absorption spectra of the phenothiazine–anthraquinone dyad 8c (recorded in CH₂Cl₂, c (8c...

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Figure 6: Absorption spectra of Do–anthraquinone dyads 8c (top) and 8e (bottom) with the corresponding refere...

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Figure 7: Normalized absorption and emission spectra of Ugi-donor compounds 2 and 10 (recorded in CH₂Cl₂, T =...

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Figure 8: Emission spectra of donor-only system 2 phenothiazine–anthraquinone dyads 8a,b (top), and the donor...

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Published 05 May 2014

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