已经开发了一种用于制备烷基芳基醚的稳健实用的方案,该方案依赖于使用两种类型的配体来促进 Cu 催化的(杂)芳基卤化物的烷氧基化。反应范围非常适用于各种偶联伙伴,尤其是具有挑战性的仲醇和(杂)芳基氯。在与芳基氯化物和溴化物偶联的情况下,两个草酸二酰胺作为强大的配体。叔丁醇首先被证明是铜催化偶联反应的配体,导致芳基碘化物在室温下完成烷氧基化。此外,许多碳水化合物衍生物适用于该偶联反应,以 29-98% 的产率提供相应的碳水化合物-芳基醚。
Thiophene-2-Carboxamide Derivatives as Alpha 7 Nicotinic Receptor Modulators
申请人:Simpson Thomas R.
公开号:US20090012127A1
公开(公告)日:2009-01-08
Compounds of Formula (I) wherein E, A and R1 are as described in the specification, pharmaceutically-acceptable salts, methods of making, pharmaceutical compositions containing and methods for using the same.
Orthogonal C–O Bond Construction with Organogermanes
作者:Amit Dahiya、Avetik G. Gevondian、Franziska Schoenebeck
DOI:10.1021/jacs.3c01081
日期:——
involves the selective coupling of arylgermanes with alkyl alcohols (primary, secondary and tertiary) as well as carboxylic acids, tolerating otherwise widely employed coupling handles, such as aromatic (pseudo)halogens (C–I, C–Br, C–Cl, C–F, C–OTf, C–OFs), silanes and boronic acid derivatives. This unprecedented [Ge]-based C–O bond construction is rapid (15 min to few hours reaction time), air-tolerant
Verfahren zur Hertsellung von Thiophenethern Thiophenether mit größeren Seitengruppen lassen sich leicht gewinnen, wenn man 2-, 3-, 2,3-, 2,4- oder 3,4-C₁-C₃-Alkoxythiophene in Gegenwart eines sauren Katalysators mit einer eine OH-Gruppe enthaltenden Verbindung umsetzt. Die neuen Thiophenether eignen sich als Monomere für elektrisch leitende Polymere.
Metal-Free Regioselective Oxidative Biaryl Coupling Leading to Head-to-Tail Bithiophenes: Reactivity Switching, a Concept Based on the Iodonium(III) Intermediate
作者:Koji Morimoto、Nobutaka Yamaoka、Chieko Ogawa、Tomofumi Nakae、Hiromichi Fujioka、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1021/ol101498r
日期:2010.9.3
A new synthetic concept for obtaining unsymmetrical biaryl coupling products by an oxidative method is reported. Our synthetic strategy casts light on the reaction intermediate for switching the reactivity of 3-substituted thiophenes. On the basis of this strategy, a novel direct method for the synthesis of head-to-tail bithiophenes using hypervalent iodine(III) reagents has been developed.