作者:Zi-Heng Zhang、Li-Jun Han、Shuang-Shuang Ma、Yi-Ran Du、Zheng-Kun Yu、Jin-Qing Lin、Bao-Hua Xu
DOI:10.1021/acs.joc.2c02245
日期:2023.1.20
The Pd(cod)Cl2-catalyzed alkoxycarbonylation of conjugated dienes to β,γ-unsaturated esters was approached by both intramolecular phosphinesulfonate L1 and intermolecular PPh3/PTSA in this study. However, the poor solubility of the Pd/L1 complex and the labile monodentate Pd/PPh3 structure restricts the system efficiency, especially for the scale-up application. By contrast, the stable and well-soluble
本研究采用分子内膦磺酸盐 L 1和分子间 PPh 3 /PTSA 来研究Pd(cod)Cl 2催化的共轭二烯烷氧基羰基化生成 β,γ-不饱和酯。然而,Pd/L 1配合物的溶解度差和不稳定的单齿Pd/PPh 3结构限制了系统效率,特别是对于放大应用。相比之下,稳定且易溶的双齿 Xantphos 系统允许在弱碱性N2中在 6 小时内以克为单位定量形成 3-戊烯酸酯 (96%)- 甲基吡咯烷酮 (NMP),它还充当促进限速醇解步骤的碱性位点,同时将配体的用量降低至理论值。