已经开发出一种高效的级联序列,用于合成2,3-二取代的咪唑并[1,2- a ]吡啶,具有中度到优异的排他选择性。该级联反应是通过使用铜(II)-Pybox作为催化剂在炔丙基醇衍生物上于吡啶氮原子处将2-氨基吡啶进行炔丙基化反应开始的,然后进行分子内环化和异构化。除了2-氨基吡啶,反应性较低的2-氨基嘧啶,2-氨基吡嗪和3-氨基哒嗪也适用于该级联反应。
已经开发出一种高效的级联序列,用于合成2,3-二取代的咪唑并[1,2- a ]吡啶,具有中度到优异的排他选择性。该级联反应是通过使用铜(II)-Pybox作为催化剂在炔丙基醇衍生物上于吡啶氮原子处将2-氨基吡啶进行炔丙基化反应开始的,然后进行分子内环化和异构化。除了2-氨基吡啶,反应性较低的2-氨基嘧啶,2-氨基吡嗪和3-氨基哒嗪也适用于该级联反应。
Silver(I)-Catalyzed Reaction between Pyrazole and Propargyl Acetates: Stereoselective Synthesis of the Scorpionate Ligands (<i>E</i>)-Allyl-<i>gem</i>-dipyrazoles (ADPs)
作者:M. Bhanuchandra、Malleswara Rao Kuram、Akhila K. Sahoo
DOI:10.1021/jo401867e
日期:2013.12.6
The reaction between readily accessible pyrazole and propargyl acetates in the presence of Ag(I) catalyst yielded a new class of (E)-allyl-gem-dipyrazole scorpionate ligands: 1-aryl-2-N-pyrazolyl allyl acetates and 1,3-dipyrazolyl-3-arylpropene. The reaction showed broad substrate scope, and various functional and protecting groups were tolerated under the reaction conditions. The palladium(II) scorpionate complex could thus be easily prepared and successfully employed in Suzuki-Miyaura cross-couplings in water.