CAS: 130-03-0; Benzo[b]Thiophen-3(2H)-One

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N,N-二乙基苯甲酰胺置于四甲基乙二胺,仲丁基锂,Lithium Diisopropyl Amide体系中,用 四氢呋喃 用作溶剂,化学反应生成1-苯并噻吩-3(2H)-酮
参考文献:定向金属化在合成中的应用,第 2 部分:甲氧基苯并 [b] 噻吩的简便合成
标题:定向金属化在合成中的应用,第 2 部分:甲氧基苯并 [b] 噻吩的简便合成
摘要:描述了一种简短,简单和方便的取代苯并 [b] 噻吩合成,包括定向邻位锂化-侧链去质子化-环化-还原.在步骤数和总产率方面,该方法对同类化合物的早期合成进行了有价值的改进.
Doi:10.1055/s-2002-19752

专利信息

专利号:US-3943142-A
优先权日:1969-01-24
标 题:Dye intermediates and their preparation and use in the synthesis of methine dyes
发明人：OWEN JOHN R
权利人:EASTMAN KODAK CO
摘要:Compositions of matter are provided comprising a stable, non-vaporous monomeric methylene base selected from a 2-methylenethiazoline; a 2-methylenebenzothiazoline; a 2-methylenenaphthothiazoline; a 2-methylenebenzoselenazoline; and a 2-methylenenaphthoselenazoline. The compositions of the invention are prepared by reacting the parent 2-methyl quaternary salt with a non-hydroxylic base which removes a proton of the heterocyclic salt together with a proton acceptor which inhibits build-up of the hydro salt of the non-hydroxylic base, the reaction being conducted under anhydrous conditions in a non-hydroxylic liquid in which the heterocyclic quaternary salt is sufficiently insoluble to inhibit dimer formation. The compositions of the invention are employed in the preparation of methine dyes.