Ligand Effects on the Pd-Catalyzed Cross-Coupling Reaction of 3-Iodoalk-2-enoates with Propargyl/1,2-Allenylic Metallic Species: An Efficient Regiodivergent Synthesis of 2,4,5-Trienoates
作者:Jinbo Zhao、Yihua Yu、Shengming Ma
DOI:10.1002/chem.200901287
日期:2010.1.4
makes a big difference: The 1,3‐lithium shift of propargyl/1,2‐allenyl lithium has been tuned and applied in a subsequent transmetalation and Pd‐catalyzed Negishi coupling reaction with 3‐iodoalk‐2‐enoates to give a highly regioselective and regiodivergent synthesis of 2,4,5‐trienoates. It was discovered that ligands play a very important role in the cross‐coupling reactions with respect to both regioselectivity
配体有很大的不同:炔丙基/ 1,2-烯丙基锂的1,3-锂转移已被调整并应用于随后的金属转移和Pd催化的Negishi与3-碘代烷基-2-烯酸酯的偶联反应,得到2,4,5-三烯酸酯的高度区域选择性和区域发散性合成。已发现,就区域选择性和反应性而言,配体在交叉偶联反应中起着非常重要的作用。