Alkynylation of Aryl Bromides with Propargylamines Catalyzed by a Palladium-Tetraphosphine Complex
作者:Henri Doucet、Maurice Santelli、Mhamed Lemhadri
DOI:10.1055/s-2005-865284
日期:——
combination with [Pd(C 3 H 5 )Cl] 2 affords a very efficient catalyst for the alkynylation of aryl bromides with propargylamines. Higher reactions rates were observed with N,N-dialkylpropargylamines than with N-methylpropargylamine or propargylamine. A wide variety of substituents such as alkyl, phenyl, methoxy, dimethylamino, fluoro, trifluoromethyl, acetyl, benzoyl, formyl, carboxylate, nitro, or nitrile
四膦全顺-1,2,3,4-四(二苯基膦基甲基)环戊烷与[Pd(C 3 H 5 )Cl] 2 组合为芳基溴化物与炔丙基胺的炔基化提供了非常有效的催化剂。N,N-二烷基炔丙基胺比N-甲基炔丙基胺或炔丙基胺观察到更高的反应速率。芳基溴化物上的多种取代基如烷基、苯基、甲氧基、二甲氨基、氟、三氟甲基、乙酰基、苯甲酰基、甲酰基、羧酸酯、硝基或腈是可以接受的。使用这些芳基溴化物中的大多数都可以获得高周转数。空间上非常拥挤的芳基溴化物如 9-溴蒽或 2,4,6-三异丙基溴苯的偶联反应也以良好的收率进行。