Sonogashira reaction of aryl halides with propiolaldehyde diethyl acetal catalyzed by a tetraphosphine/palladium complex
作者:Mhamed Lemhadri、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2005.06.062
日期:2005.10
All-cis-1,2,3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane/[PdCl(C3H5)]2 efficiently catalyzes the Sonogashira reaction of propiolaldehyde diethyl acetal with a variety of aryl bromides and chlorides. A minor electronic effect of the substituents of the aryl bromide was observed. Similar reaction rates were observed in the presence of activated aryl bromides such as 4-trifluoromethylbromobenzene and deactivated
清一色顺-1,2,3,4-四(二苯基膦基)环戊烷/ [的PdCl(C 3 H ^ 5)] 2有效地催化丙醛二乙基乙缩醛与各种芳基溴化物和氯化物的Sonogashira反应。观察到芳基溴的取代基的电子效应较小。在活化的芳基溴化物(例如4-三氟甲基溴苯)和失活的芳基溴化物(例如溴苯甲醚)的存在下,观察到相似的反应速率。该反应的营业额最高可达到95,000。甚至芳基氯化物和杂芳基溴化物或氯化物也已被该催化剂成功地炔基化。此外,芳基卤化物上的各种取代基如氟,三氟甲基,乙酰基,苯甲酰基,甲酰基,硝基,二甲基氨基或腈是可容许的。
Palladium-catalysed hydroarylation and hydrovinylation of 3,3-dialkoxy-1-aryl-1-propynes. An approach to 3-aryl- and 3-vinylquinolines
作者:Sandro Cacchi、Giancarlo Fabrizi、Fabio Marinelli、Leonardo Moro、Paola Pace
DOI:10.1016/0040-4020(96)00557-1
日期:1996.7
Acetylenic acetals and ketals have been reacted with aryl and vinyl halides to generate hydroarylation and hydrovinylation products. The reaction proceeds with high regioselectivity. The carbopalladation step appears to be mainly controlled by stericeffects and the new carbon-carbon bond is generated preferentially on the carbon bearing the acetal group. The reaction has been employed to develop a