Tandem Ring Opening/Intramolecular [2 + 2] Cycloaddition Reaction for the Synthesis of Cyclobutane Fused Thiazolino-2-Pyridones.

Tandem Ring Opening/Intramolecular [2 + 2] Cycloaddition Reaction for the Synthesis of Cyclobutane Fused Thiazolino-2-Pyridones.
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串联开环/分子内[2 + 2]环加成反应合成环丁烷稠合噻唑啉-2-吡啶酮。

DOI:
10.1021/acs.joc.1c01875
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发表时间:
2021-12-03
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Almqvist F
Almqvist F
中科院分区:
其他
文献类型:
--
作者:
Tyagi M;Adolfsson DE;Singh P;Ådén J;Jayaweera SW;Gharibyan A;Bharate JB;Kiss A;Sarkar S;Olofsson A;Almqvist F

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在碳酸铯存在下,噻唑啉稠合2-吡啶酮与卤代烷反应,通过S烷基化开环,生成N-烯基功能化2-吡啶酮。在与炔丙基溴的反应中,通过原位生成的丙二烯和α,β不饱和甲酯之间的[2+2]环加成反应,噻唑啉环打开和关闭。这种方法能够合成多种环丁烷稠合的噻唑基-2-吡啶酮,其中一些类似物抑制淀粉样蛋白β1-40原纤维的形成。此外,其他类似物能够结合成熟的α-突触核蛋白和淀粉样蛋白β1−40纤维。几个具有生物活性的噻唑啉稠合2-吡啶酮可以容忍这种转化,此外,它还提供了一个外环烯作为调节生物活性的潜在句柄。
Reaction of thiazoline fused 2-pyridones with alkyl halides in the presence of cesium carbonate opens the thiazoline ring via S-alkylation and generates N-alkenyl functionalized 2-pyridones. In the reaction with propargyl bromide, the thiazoline ring opens and subsequently closes via a [2 + 2] cycloaddition between an in situ generated allene and the α,β-unsaturated methyl ester. This method enabled the synthesis of a variety of cyclobutane fused thiazolino-2-pyridones, of which a few analogues inhibit amyloid β1–40 fibril formation. Furthermore, other analogues were able to bind mature α-synuclein and amyloid β1−40 fibrils. Several thiazoline fused 2-pyridones with biological activity tolerate this transformation, which in addition provides an exocyclic alkene as a potential handle for tuning bioactivity.
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