General and Efficient Route for the Synthesis of 3,4-Disubstituted Coumarins via Pd-Catalyzed Site-Selective Cross-Coupling Reactions
作者:Liang Zhang、Tianhao Meng、Renhua Fan、Jie Wu
DOI:10.1021/jo071117+
日期:2007.9.1
Palladium-catalyzed site-selective cross-coupling reactions of 3-bromo-4-trifloxycoumarin or 3-bromo-4-tosyloxycoumarin provide an efficient and facile route for the synthesis of 3,4-disubstituted coumarins, which include 3,4-diarylcoumarins, 3-amino-4-arylcoumarins, and 3-aryl-4-aminocoumarins. The order of reactivity of the (pseudo)halide substituents in the coumarins was found to be 4-OTf > 3-Br
3-溴-4-三氟香豆素或3-溴-4-甲苯磺酰香豆素的钯催化的位点选择性交叉偶联反应为合成3,4-二取代香豆素提供了一种有效而便捷的途径,其中包括3,4-二芳基香豆素。 ,3-氨基-4-芳基香豆素和3-芳基-4-氨基香豆素。发现香豆素中(伪)卤化物取代基的反应性顺序为4-OTf> 3-Br> 4-OTs。