在三氟甲磺酸三甲基硅酯的促进下，吲哚、呋喃和噻吩与芳基甲基乙酸酯的 Friedel-Crafts 烷基化反应

IF 1.8 3区化学 Q3 CHEMISTRY, ORGANIC Synthetic Communications Pub Date : 2024-09-02 DOI:10.1080/00397911.2024.2397717

Helen L. Xia , Eric Zhou , Bianca Bicalho , C. Wade Downey

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引用次数: 0

摘要

在三氟甲磺酸三甲基硅酯（TMSOTf）和 2,6- 丁烷存在下，仲芳基甲基乙酸酯处理各种吲哚时，会在 3 位发生 Friedel-Crafts 烷基化反应。叔苄醇也是有效的烷化剂，在 TMSOTf 的促进下活化生成具有季中心的烷基化吲哚。相关研究表明，苯并呋喃在类似条件下与类似的烷化剂发生反应，生成 2-烷基化的苯并呋喃。在多种底物组合下，这些弗里德尔-卡夫斯烷基化产物的产率在 43%-99% 之间。

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Friedel–crafts alkylations of indoles, furans, and thiophenes with arylmethyl acetates promoted by trimethylsilyl trifluoromethanesulfonate

Various indoles undergo Friedel–Crafts alkylation at the 3-position when treated with secondary arylmethyl acetates in the presence of trimethylsilyl trifluoromethanesulfonate (TMSOTf) and 2,6-lutidine. Tertiary benzylic alcohols are also effective alkylating agents, undergoing TMSOTf-promoted activation to yield alkylated indoles that feature quaternary centers. A related study shows that benzofuran reacts under similar conditions to yield 2-alkylated benzofurans when treated with similar alkylating agents, and the reaction has been extended to include other representative heteroarenes. Yields for these Friedel–Crafts alkylation products range from 43%–99% over a wide range of substrate combinations.

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来源期刊

Synthetic Communications 化学-有机化学

CiteScore

4.40

自引率

4.80%

发文量

156

审稿时长

4.3 months

期刊介绍： Synthetic Communications presents communications describing new methods, reagents, and other synthetic work pertaining to organic chemistry with sufficient experimental detail to permit reported reactions to be repeated by a chemist reasonably skilled in the art. In addition, the Journal features short, focused review articles discussing topics within its remit of synthetic organic chemistry.