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2 article(s) from de Abreu, Ruben Manuel Figueira

Synthesis of benzo[f]quinazoline-1,3(2H,4H)-diones

Ruben Manuel Figueira de Abreu,
Peter Ehlers and
Peter Langer

Beilstein J. Org. Chem. 2024, 20, 2708–2719, doi:10.3762/bjoc.20.228

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Figure 1: Synthesis of uracil-based alkynes and aryl structures [51,62-65].

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Figure 2: Structures of uracil derivatives A, B, and C.

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Scheme 1: Strategy for the synthesis of the cyclised product 5. Conditions: i) Br₂ (2 equiv), Ac₂O (1.5 equiv...

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Scheme 2: Synthesis and isolated yields of 1,3-dimethyl-5-aryl-6-[2-(aryl)ethynyl]uracils 4a–i. Reaction cond...

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Scheme 3: Scope and isolated yields of the synthesis of 5. Reaction conditions: 4 (1 equiv), p-TsOH·H₂O (20 e...

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Scheme 4: Proposed reaction mechanism of the cyclisation with N,N-dimethylanilino functional groups.

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Figure 3: UV–vis absorption (left) and emission (right, λ_ex = 400 nm) spectra of 5a, 5d, 5f, 5g, 5h, and 5i i...

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Published 28 Oct 2024

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Synthesis and properties of 6-alkynyl-5-aryluracils

Ruben Manuel Figueira de Abreu,
Till Brockmann,
Alexander Villinger,
Peter Ehlers and
Peter Langer

Beilstein J. Org. Chem. 2024, 20, 898–911, doi:10.3762/bjoc.20.80

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Figure 1: Uracil derivatives in drugs.

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Figure 2: Present work as compared to previous studies [25,57-59].

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Scheme 1: Synthesis of 1,3-dimethly-5-[2-(aryl)ethynyl]-6-[2-(aryl)ethynyl]uracils 4 and 1,3-dimethyl-5-aryl-...

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Scheme 2: Synthesis of 5-bromo-1,3-dimethyl-6-[2-(aryl)ethynyl]uracils 3a–j. Reaction conditions: 2 (1.0 equi...

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Scheme 3: Structure of the starting material 2 with its possible mesomeric structures.

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Scheme 4: Synthesis of 1,3-dimethyl-5-[2-(aryl)ethynyl]-6-[2-(aryl)ethynyl]uracils 4a–h. Reaction conditions: ...

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Scheme 5: Synthesis of 1,3-dimethyl-5-aryl-6-[2-(aryl)ethynyl]uracils 5a–t. Reaction conditions: 3 (1 equiv),...

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Figure 3: ORTEP diagram of 5a front view (a) and side view (b). a) Interactions of the molecules within and b...

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Figure 4: UV–vis absorption (left) and emission (right, λ_ex = 400 nm) spectra of 1,3-dimethyl-5-phenyl-6-[2-(...

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Published 22 Apr 2024

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