Palladium-catalyzed tandem allylic substitution/cyclization and cascade hydrosilylated reduction: the influence of reaction parameters and hydrosilanes on the stereoselectivity
作者:Peng-Wei Long、Jian-Xing Xu、Xing-Feng Bai、Zheng Xu、Zhan-Jiang Zheng、Ke-Fang Yang、Li Li、Li-Wen Xu
DOI:10.1039/c8ra02995d
日期:——
palladium-catalyzed tandem allylic alkylation in the presence of Fei-Phos (a chiral trans-1,2-diaminocyclohexane-derived phosphine ligand), the effect of different phosphine ligands, inorganic or organic bases, Brønsted acids, and other additives on the asymmetric palladium-catalysed alkylation of catechol with allylic diacetate was investigated. In this reaction, 2-vinyl-2,3-dihydro-benzo[1,4]dioxin products with
为了阐明在 Fei-Phos(手性反式-1,2-二氨基环己烷衍生的膦配体)存在下反应参数对钯催化的串联烯丙基烷基化的影响,不同膦配体、无机或有机碱的影响、布朗斯台德酸和其他添加剂对邻苯二酚与烯丙基二乙酸酯的不对称钯催化烷基化作用进行了研究。在该反应中,以良好的收率获得了具有良好对映选择性的 2-vinyl-2,3-dihydro-benzo[1,4]dioxin 产物。此外,据报道,甲基苯基硅烷辅助的新型钯催化三组分和一锅烯丙基取代/环化/还原反应具有良好的选择性。