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:
影响因子:
--
通讯作者:
Almqvist F
中科院分区:
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
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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