Pd(II)—dppb and syngas catalyze regioselective hydroesterification of terminal alkynes under neutral conditions
作者:Bassam El Ali、Jimoh Tijani、Abdel Moneim El-Ghanam
DOI:10.1016/s0040-4039(01)00152-6
日期:2001.3
Palladium(II) regioselectively catalyzes the hydroesterification of terminalalkynesunder syngas forming α,β-unsaturated esters 3 and 4 in excellent chemical yields under neutral conditions. The high selectivity for the linear ester 4 was obtained with a catalytic system that includes Pd(II), 1,4-bis(diphenylphosphino)butane (dppb) and CO/H2 in CH2Cl2 as solvent. The control of the regioselectivity
在中性条件下,钯(II)在合成气中区域选择性地催化末端炔烃的加氢酯化反应,形成出色的化学收率的α,β-不饱和酯3和4。通过在包括CH 2 Cl 2的溶剂中包含Pd(II),1,4-双(二苯基膦基)丁烷(dppb)和CO / H 2的催化体系获得对线性酯4的高选择性。区域选择性的控制在很大程度上取决于配体的类型,溶剂和合成气混合物的使用。
Bifunctional ligands for Pd-catalyzed selective alkoxycarbonylation of alkynes
作者:Huimin Qi、Zijun Huang、Menglan Wang、Peiju Yang、Chen-Xia Du、Shu-Wei Chen、Yuehui Li
DOI:10.1016/j.jcat.2018.04.007
日期:2018.7
represent straightforward and atom-economic synthesis of α,β-unsaturatedcarbonylcompounds. One of the issues associated with the currently known catalytic systems is insufficient efficiency. In this context, Pd/ligand-catalyzed regioselective and efficient alkoxycarbonylation of terminal alkynes is desirable for the synthesis of α,β-unsaturated esters. Herein, we present the use of a newly designed