Formation of a Quaternary Carbon Center through the Pd(0)/PhCOOH-Catalyzed Allylation of Cyclic β-Keto Esters and 1,3-Diketones with Alkynes
作者:Nitin T. Patil、Yoshinori Yamamoto
DOI:10.1021/jo0490144
日期:2004.9.1
Formation of a quaternary carbon center through the allylation of β-keto esters and 1,3-diketones with alkynes is accomplished by the use of Pd(0)/benzoic acid catalyst. Reactions of various cyclic β-keto esters and 1,3-diketones with alkynes in the presence of Pd2dba3·CHCl3 (5 mol %), PPh3 (40 mol %), and PhCOOH (10 mol %) proceeded at 100 °C in toluene (5 M) to give the corresponding allylation products
通过使用Pd(0)/苯甲酸催化剂,将β-酮酸酯和1,3-二酮与炔烃进行烯丙基化,可以形成季碳中心。在Pd 2 dba 3 ·CHCl 3(5 mol%),PPh 3(40 mol%)和PhCOOH(10 mol%)的存在下,各种环状β-酮酸酯和1,3-二酮与炔的反应100°C的甲苯溶液(5 M)以高选择性和立体选择性的方式提供相应的烯丙基化产物。还讨论了不对称烯丙基化的可能性。